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{{Short description|none}}
This is a list of [[dinosaur]]s whose remains have been recovered from [[North America]]. North America has a rich dinosaur fossil record with great diversity of dinosaurs.

== History ==
The earliest potential record of dinosaurs in North America comes from rare, unidentified (possibly [[Theropoda|theropod]]) footprints in the Middle-Late [[Triassic]] [[Pekin Formation]] of [[North Carolina]].<ref>HUBER, P. (1998). The oldest Late Triassic footprint assemblage from North America (Pekin Formation, Deep River Basin, North Carolina, USA). ''Southeastern Geology'', ''38''(2), 77-90.</ref> However, the most reliable early record of North American dinosaurs comes from fragmentary [[Saurischia|saurischian]] fossils unearthed from the [[Late Triassic|Upper Triassic]] [[Dockum Group]] of Texas.<ref>{{Cite journal |last=Sarıgül |first=Volkan |date=2018-11-17 |title=New archosauromorph fragments from the Dockum Group of Texas and assessment of the earliest dinosaurs in North America |journal=Historical Biology |volume=30 |issue=8 |pages=1059–1075 |doi=10.1080/08912963.2017.1333609 |s2cid=134371261 |issn=0891-2963}}</ref> Later in the Triassic period, dinosaurs left more recognizable remains, and could be identified as specific genera. Examples of later Triassic North American dinosaur genera include ''[[Coelophysis]]'', ''[[Chindesaurus]]'', ''[[Gojirasaurus]]'', and ''[[Tawa (dinosaur)|Tawa]]''. Fossils of ''Tawa''-like dinosaurs have also been found in South America, which has important indications about [[paleogeography]]. During the [[Early Jurassic|Early Jurassic Period]], dinosaurs such as ''[[Dilophosaurus]]'', ''[[Anchisaurus]]'', ''[[Coelophysis]]'' (formerly known as ''Megapnosaurus''), and the early thyreophoran ''[[Scutellosaurus]]'' lived in North America. The latter is believed to have been the ancestor of all [[stegosaurs]] and [[ankylosaurs]]. The [[Middle Jurassic]] is the only poorly represented time period in North America, although several Middle Jurassic localities are known from Mexico. Footprints, eggshells, teeth, and fragments of bone representing theropods, sauropods, and ornithopods have been found, but none of them are diagnostic to the [[genus]] level.
[[File:Going Where the Dinosaurs Roamed In the US.ogv|thumb|[[VOA]] report about North American dinosaurs]] 
The [[Late Jurassic]] of North America, however, is the exact opposite of the Middle Jurassic. The Late Jurassic [[Morrison Formation]] is found in several U.S. states, including [[Colorado]], [[Utah]], [[Wyoming]], [[Montana]], [[New Mexico]], [[Oklahoma]], [[South Dakota]], and [[Texas]]. It is notable as being the most fertile single source of dinosaur fossils in the world. The roster of dinosaurs from the Morrison is impressive. Among the theropods, ''[[Allosaurus]]'', ''[[Saurophaganax]]'', ''[[Torvosaurus]]'', ''[[Ceratosaurus]]'', ''[[Coelurus]]'', ''[[Ornitholestes]]'', ''[[Tanycolagreus]]'', ''[[Stokesosaurus]]'', and ''[[Marshosaurus]]'' are found in the Morrison. An abundance of sauropods has been found there, including ''[[Apatosaurus]]'', ''[[Diplodocus]]'', ''[[Barosaurus]]'', ''[[Brachiosaurus]]'', ''[[Camarasaurus]]'', ''[[Brontosaurus]]'' and ''[[Amphicoelias]]''. Three genera of stegosaurs, ''[[Alcovasaurus]]'', ''[[Stegosaurus]]'' and ''[[Hesperosaurus]]'', have been found there. Finally, ornithopods found in the Morrison include ''[[Camptosaurus]], [[Dryosaurus]],'' and ''[[Nanosaurus]]'', 

During the [[Early Cretaceous]], new dinosaurs evolved to replace the old ones. Sauropods were still present, but they were not as diverse as they were in the Jurassic Period. Theropods from the Early Cretaceous of North America include [[dromaeosaurids]] such as ''[[Deinonychus]]'' and ''[[Utahraptor]]'', the carnosaur ''[[Acrocanthosaurus]]'', and the coelurosaur ''[[Microvenator]]''. Sauropods included ''[[Astrodon]]'', ''[[Brontomerus]]'', and ''[[Sauroposeidon]]''. Ornithischians were more diverse than they were in the Jurassic Per''[[Tenontosaurus]]'',''[[Dakotadon]]'',''[[hoplitosaurus]]'' are some of the ornithopods that lived during this time period. Ankylosaurs replaced their stegosaur cousins in the Cretaceous. Ankylosaurs from the Early Cretaceous of North America include ''[[Sauropelta]]'' and ''[[Gastonia (dinosaur)|Gastonia]]''. Therizinosaurs such as ''[[Falcarius]]'' are also known from the Early Cretaceous of North America.

Finally, during the [[Late Cretaceous]] Period, dinosaurs continued to diversify, with the [[Cenomanian]] stage seeing the rise of [[hadrosaurs]] such as ''[[Eolambia]]'', and ''[[Protohadros]]'', as well  tyrannosaurs such as ''[[Moros intrepidus]]'', which would eventually replace the carnosaurs, like ''[[Siats]]'', as the continent’s apex predators. These groups continued to thrive into the [[Turonian]] stage,  in which therizinosaurs like ''[[Nothronychus]]'' and larger ceratopsians such as  ''[[Zuniceratops]]'' lived. During the [[Campanian]] stage of the Late Cretaceous, an enormous diversity of dinosaurs is known. Theropods included the tyrannosaurs ''[[Albertosaurus]]'', ''[[Gorgosaurus]]'', ''[[Daspletosaurus]]'', ''[[Teratophoneus]]'', ''[[Bistahieversor]]'', and ''[[Appalachiosaurus]]'', and the dromaeosaurids ''[[Dromaeosaurus]]'', ''[[Saurornitholestes]]'', ''[[Atrociraptor]]'', and ''[[Bambiraptor]]''. Ceratopsians, such as ''[[Pachyrhinosaurus]]'', ''[[Styracosaurus]]'', ''[[Centrosaurus]]'', ''[[Monoclonius]]'', ''[[Brachyceratops]]'' and ''[[Pentaceratops]]'' also existed. Among hadrosaurs,'' [[Hypacrosaurus]], [[Gryposaurus]], [[Kritosaurus]], [[Parasaurolophus]]'', ''[[Corythosaurus]]'', ''[[Lambeosaurus]]'' and ''[[Prosaurolophus]]'' existed. During the latest Cretaceous, the [[Maastrichtian]] age, the diversity of dinosaurs saw a decline from the preceding Campanian stage. North American herbivorous dinosaurs from this time period include the [[titanosaur]] sauropod ''[[Alamosaurus]]'', the ceratopsians ''[[Bravoceratops]]'', ''[[Regaliceratops]]'', ''[[Triceratops]]'', ''[[Leptoceratops]]'', ''[[Torosaurus]]'', ''[[Nedoceratops]]'', ''[[Tatankaceratops]]'' (the latter two possible species of ''Triceratops''), and ''[[Ojoceratops]]'', the pachycephalosaurs ''[[Pachycephalosaurus]]'', ''[[Stygimoloch]]'', ''[[Dracorex]]'', and ''[[Sphaerotholus]]'', the hadrosaurs ''[[Augustynolophus]]'', ''[[Saurolophus]]'' and ''[[Edmontosaurus]]'', the ornithopod ''[[Thescelosaurus]]'' the ankylosaur ''[[Ankylosaurus]]'' and the nodosaurs ''[[Denversaurus]]'', ''[[Glyptodontopelta]]'' and ''[[Edmontonia]]''. Predatory dinosaurs from this time period included the tyrannosaurids ''[[Tyrannosaurus]]'', ''[[Nanotyrannus]]'' (which may just be a juvenile of the former) and ''[[Dryptosaurus]]'', the ornithomimids ''[[Ornithomimus]]'', ''[[Dromiceiomimus]]'', ''[[Struthiomimus]],'' the oviraptorids ''[[Anzu (dinosaur)|Anzu]]'', ''[[Leptorhynchos (dinosaur)|Leptorhynchos]]'' and ''[[Ojoraptorsaurus]]'', the troodontids ''[[Pectinodon]]'', ''[[Paronychodon]]'' and ''[[Troodon]]'', the coelurosaur ''[[Richardoestesia]]'' and the dromaeosaurs ''[[Acheroraptor]]'' and ''[[Dakotaraptor]]''.

The only recorded find of a dinosaur fossil in Central America consists of a single femur discovered from [[Middle Cretaceous]] age deposits in [[Comayagua Department]] in the central part of [[Honduras]]. The fossil had been found in January, 1971 by Bruce Simonson and Gregory Horne, though it was later sent to the [[National Museum of Natural History|National Museum of Natural History, USA]] where it is deposited under catalogue number USNM PAL 181339. The discovery was not formally described until 1994 where it was identified as the femur of a small hadrosaur or iguanodontid, probably the former.<ref>{{Cite journal |last=Horne |first=Gregory S. |date=1994-03-31 |title=A mid-Cretaceous ornithopod from central Honduras |url=http://www.tandfonline.com/doi/abs/10.1080/02724634.1994.10011548 |journal=Journal of Vertebrate Paleontology |language=en |volume=14 |issue=1 |pages=147–150 |doi=10.1080/02724634.1994.10011548 |bibcode=1994JVPal..14..147H |issn=0272-4634}}</ref> The first report of a dinosaur from Central America ever however was a newspaper article published in August of 1933 by Canada's [[Montreal Gazette]], though the story was picked up by several American newspapers. The fossil was an isolated metatarsus that had been collected by [[University of Pennsylvania]] explorer George Mason from woods near [[Olanchito]], Honduras, though a vertebra was also mentioned to be found by locals. The bones have since been lost and their true identity remains indeterminable.<ref>{{Cite web |title=HONDURAS AND THE DINOSAURS - Escuela de Biología |url=https://biologia.unah.edu.hn/museos-y-unidades/ceiticb/articulos/dinosaurs-fossil-honduras/ |access-date=2022-07-29 |website=biologia.unah.edu.hn |language=es}}</ref>

==Criteria for inclusion==
*The genus must appear on the [[List of dinosaur genera]].
*At least one named species of the creature must have been found in [[North America]].
*This list is a complement to [[:Category:Mesozoic dinosaurs of North America]].

== List of North American dinosaurs ==

=== Valid genera<!--dinosaurs that do not have a note on [[List of dinosaur genera]] and don't redirect, and have their taxonomy template set within Dinosauria but outside Avialae--> ===


{| class="wikitable sortable" align="center" width="100%"
|-
! Name
! Year 
! Formation
! Location
! Notes
! Images<!--Life restorations are preferred, but in the absence of accurate ones, skeletons and size charts may be used instead. It is NOT REQUIRED for the images here to be the same as on their articles.-->
|-
| ''[[Abydosaurus]]''
| 2010
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Albian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Had a short domed crest on its skull similar to that of ''[[Giraffatitan]]''
| [[File:Abydosaurus NT.jpg|200px]]
|-
| ''[[Acantholipan]]''
| 2018
| [[Pen Formation]] ([[Late Cretaceous]], [[Santonian]])
| {{flag|Mexico}}<br />({{flag|Coahuila}})
| Known to possess spike-like osteoderms
| [[File:Acantholipan gonzalezi.jpg|200px]]
|-
| ''[[Achelousaurus]]''
| 1994
| [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Combines long spikes on the top of its frill and a low keratinous boss over its eyes and nose
| [[File:Achelousaurus dinosaur.png|200px]]
|-
| ''[[Acheroraptor]]''
| 2013
| [[Hell Creek Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|Montana}})
| One of the geologically youngest dromaeosaurids
| [[File:Acheroraptor NT small.jpg|200px]]
|-
| ''[[Acristavus]]''
| 2011
| [[Two Medicine Formation]], [[Wahweap Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}}<br />{{flag|Utah}})
| Uniquely for a hadrosaurid, it lacked any ornamentation on its skull
| [[File:Acristavus gagslarsoni.png|200px]]
|-
| ''[[Acrocanthosaurus]]''
| 1950
| [[Antlers Formation]], [[Arundel Formation]], [[Cloverly Formation]], [[Twin Mountains Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Maryland}}<br />{{flag|Oklahoma}}<br />{{flag|Texas}}<br />{{flag|Wyoming}})
| Possessed elongated neural spines that would have supported a low sail or hump in life
| [[File:Acrocanthosaurus atokensis.png|200px]]
|-
| ''[[Acrotholus]]''
| 2013
| [[Milk River Formation]] ([[Late Cretaceous]], [[Santonian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Had a tall, oval-shaped dome
| [[File:Acrotholus NT.jpg|200px]]
|-
| ''[[Adelolophus]]''
| 2014
| [[Wahweap Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Potentially a close relative of ''[[Parasaurolophus]]''<ref>{{cite journal | title=The first duckbill dinosaur (Hadrosauridae: Lambeosaurinae) from Africa and the role of oceanic dispersal in dinosaur biogeography | last1=Longrich | first1=Nicholas R. | last2=Suberbiola | first2=Xabier Pereda | last3=Pyron | first3=R. Alexander | last4=Jalil | first4=Nour-Eddine | journal=Cretaceous Research | year=2021|volume=120|page=104678 | doi=10.1016/j.cretres.2020.104678| bibcode=2021CrRes.12004678L | s2cid=228807024 | doi-access=free }}</ref>
| [[File:Adelolophus LM.png|200px]]
|-
| ''[[Agujaceratops]]''
| 2006
| [[Aguja Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Texas}})
| The type species was originally assigned to the genus ''[[Chasmosaurus]]''
| [[File:Agujaceratops life restoration.jpg|200px]]
|-
| ''[[Ahshislepelta]]''
| 2011
| [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Relatively small compared to other North American ankylosaurs
| [[File:Ahshislepelta LM.png|200px]]
|-
| ''[[Ahvaytum]]''
| 2025
| [[Popo Agie Formation]] ([[Late Triassic]], [[Carnian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| One of the oldest North American dinosaurs
|
|-
| ''[[Akainacephalus]]''
| 2018
| [[Kaiparowits Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Much of the skeleton is known, including the entirety of the skull
| [[File:Akainacephalus (updated).png|200px]]
|-
| ''[[Alamosaurus]]''
| 1922
| [[Black Peaks Formation]], [[El Picacho Formation]], [[Evanston Formation]]?, [[Javelina Formation]], [[North Horn Formation]], [[Ojo Alamo Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|New Mexico}}<br />{{flag|Texas}}<br />{{flag|Utah}}<br />{{flag|Wyoming}}?)
| The only titanosaur confirmed to have crossed into North America. One of the largest dinosaurs known from the continent<ref>{{Cite journal | doi = 10.4202/app.2010.0105| title = The First Giant Titanosaurian Sauropod from the Upper Cretaceous of North America| journal = Acta Palaeontologica Polonica| volume = 56| issue = 4| page = 685| year = 2011| last1 = Fowler | first1 = D. W. | last2 = Sullivan | first2 = R. M. | citeseerx = 10.1.1.694.3759| s2cid = 53126360}}</ref>
| [[File:Alamosaurus-sanjuanensis.jpg|200px]]
|-
| ''[[Alaskacephale]]''
| 2006
| [[Prince Creek Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Alaska}})
| Had an array of polygonal nodes on its [[squamosal]]
| [[File:Alaskacephale gangloffi copia.jpg|200px]]
|-
| ''[[Albertaceratops]]''
| 2007
| [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Possessed long brow horns and a bony ridge over its nose
| [[File:Albertaceratops BW.jpg|200px]]
|-
| ''[[Albertadromeus]]''
| 2013
| [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| The proportions of its hindlimb suggest a cursorial lifestyle
| [[File:Albertadromeus LM.png|200px]]
|-
| ''[[Albertavenator]]''
| 2017
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Its discovery suggests that the diversity of small dinosaurs may be higher than previously thought
| [[File:Albertavenator LM.png|200px]]
|-
| ''[[Albertonykus]]''
| 2009
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| May have used its specialized forelimbs to dig into tree trunks for feeding on termites<ref>{{cite journal |last=Longrich |first=Nicholas R. |author2=Currie, Philip J. |year=2009 |title=''Albertonykus borealis'', a new alvarezsaur (Dinosauria: Theropoda) from the Early Maastrichtian of Alberta, Canada: Implications for the systematics and ecology of the Alvarezsauridae |journal=Cretaceous Research |volume=30 |issue=1 |pages= 239–252|doi=10.1016/j.cretres.2008.07.005 |bibcode=2009CrRes..30..239L }}</ref>
| [[File:Albertonykus borealis.jpg|200px]]
|-
| ''[[Albertosaurus]]''
| 1905
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Known from more than thirty specimens, twenty-six of which are preserved together<ref>{{cite journal | last1 = Eberth | first1 = David A. | last2 = Currie | first2 = Philip J. | year = 2010 | title = Stratigraphy, sedimentology, and taphonomy of the ''Albertosaurus'' bonebed (upper Horseshoe Canyon Formation; Maastrichtian), southern Alberta, Canada | journal = Canadian Journal of Earth Sciences | volume = 47 | issue = 9| pages = 1119–1143 | doi = 10.1139/e10-045 | bibcode = 2010CaJES..47.1119E }}</ref>
| [[File:Albertosaurus NT small.jpg|200px]]
|-
| ''[[Aletopelta]]''
| 2001
| [[Point Loma Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|California}})
| Would have lived in present-day Mexico. Its fossils were only found in California due to the shifting of tectonic plates
| [[File:Aletopelta NT.jpg|200px]]
|-
| ''[[Allosaurus]]''
| 1877
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Oklahoma}}<br />{{flag|Utah}}<br />{{flag|Wyoming}})
| Multiple specimens have been discovered, making it well-known both popularly and scientifically. At least three species are known from the United States, in addition to one described from Portugal
| [[File:Allosaurus Revised.jpg|200px]]
|-
| ''[[Ampelognathus]]''
| 2023
| [[Lewisville Formation]] ([[Late Cretaceous]], [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Texas}})
| More closely related to iguanodonts than to the morphologically similar "hypsilophodonts"<ref>{{Cite journal |last1=Tykoski |first1=Ronald S. |last2=Contreras |first2=Dori L. |last3=Noto |first3=Christopher |date=2023-10-13 |title=The first small-bodied ornithopod dinosaur from the Lewisville Formation (middle Cenomanian) of Texas|journal=Journal of Vertebrate Paleontology |volume=43 |issue=2 |language=en |doi=10.1080/02724634.2023.2257238 |issn=0272-4634|doi-access=free }}</ref>
| [[File:Ampelognathus UDL.png|200px]]
|-
| ''[[Amphicoelias]]''
| 1878
| [[Morrison Formation]] ([[Late Jurassic]], [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}})
| Originally believed to date from the Cretaceous
| [[File:Amphicoelias17DB2.jpg|200px]]
|-
| ''[[Anasazisaurus]]''
| 1993
| [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| May have been a second species of ''[[Kritosaurus]]''<ref>Prieto-Márquez, A. 2014. "Skeletal morphology of Kritosaurus navajovius (Dinosauria:Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini". Journal of Systematic Palaeontology 12(2): 133-175</ref>
| [[File:Anasazisaurus LM.png|200px]]
|-
| ''[[Anchiceratops]]''
| 1914
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Had a long, rectangular frill ringed by short, triangular spikes
| [[File:Anchiceratops dinosaur.png|200px]]
|-
| ''[[Anchisaurus]]''
| 1885
| [[Portland Formation]] ([[Early Jurassic]], [[Hettangian]] to [[Sinemurian]])
| {{flag|United States}}<br />({{flag|Connecticut}}<br />{{flag|Massachusetts}})
| Some possible remains were originally misidentified as human skeletons<ref>{{cite journal|last=Smith|first=Nathan|title=Fossil bones found in red sandstones|journal=American Journal of Science|year=1820|volume=2|pages=146–147}}</ref>
| [[File:Anchisaurus NT.jpg|200px]]
|-
| ''[[Angulomastacator]]''
| 2009
| [[Aguja Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Texas}})
| The tip of its jaw was angled 45° at its anterior end, with the tooth row bent to match
| [[File:Life reconstruction of Angulomastacator daviesi.png|200px]]
|-
| ''[[Animantarx]]''
| 1999
| [[Cedar Mountain Formation]] ([[Early Cretaceous]] to [[Late Cretaceous]], [[Albian]] to [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Its holotype was discovered during a radiological survey of a fossil site. No bones were exposed before it was excavated
| [[File:Animantarx ramaljonesi.png|200px]]
|-
| ''[[Ankylosaurus]]''
| 1908
| [[Ferris Formation]], [[Frenchman Formation]], [[Hell Creek Formation]], [[Lance Formation]], [[Scollard Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}}<br />{{flag|Saskatchewan}})<br />{{flag|United States}}<br />({{flag|Montana}}<br />{{flag|Wyoming}})
| The largest and most well-known ankylosaur
| [[File:Ankylosaurus magniventris by sphenaphinae.png|200px]]
|-
| ''[[Anodontosaurus]]''
| 1929
| [[Dinosaur Park Formation]], [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Originally mistakenly believed to have been toothless
| [[File:Anodontosaurus LM.png|200px]]
|-
| ''[[Anzu wyliei|Anzu]]''
| 2014
| [[Hell Creek Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|Montana}}<br />{{flag|North Dakota}}<br />{{flag|South Dakota}})
| Large and known from considerably good remains. Preserves evidence of a tall head crest
| [[File:Anzu wyliei.jpg|200px]]
|-
| ''[[Apatoraptor]]''
| 2016
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Quill knobs preserved on its ulna confirm this genus had wings
| [[File:Apatoraptor NT small.jpg|200px]]
|-
| ''[[Apatosaurus]]''
| 1877
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|New Mexico}}<br />{{flag|Oklahoma}}<br />{{flag|Utah}}<br />{{flag|Wyoming}})
| Had a characteristically robust skeleton compared to other diplodocids
| [[File:Apatosaurus louisae by durbed.jpg|200px]]
|-
| ''[[Appalachiosaurus]]''
| 2005
| [[Blufftown Formation]]?, [[Demopolis Chalk]], [[Donoho Creek Formation]]?, [[Ripley Formation]]?, [[Tar Heel/Coachman Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Alabama}}<br />{{flag|Georgia (U.S. state)}}?<br />{{flag|North Carolina}}?<br />{{flag|South Carolina}}?)
| The most complete theropod known from [[Appalachia (landmass)|the eastern side of North America]]
| [[File:Appalachiosaurus montgomeriensis.jpg|200px]]
|-
| ''[[Aquilarhinus]]''
| 2019
| [[Aguja Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Texas}})
| May have been a semiaquatic, coastal species that used its unusual, shovel-shaped bill to scoop up vegetation in wet sediment<ref>{{cite journal|last1=Prieto-Márquez|first1=Albert|last2=Wagner|first2=Jonathan R.|last3=Lehman|first3=Thomas|date=2020|title=An unusual 'shovel-billed' dinosaur with trophic specializations from the early Campanian of Trans-Pecos Texas, and the ancestral hadrosaurian crest|url=https://www.tandfonline.com/doi/abs/10.1080/14772019.2019.1625078?journalCode=tjsp20|journal=Journal of Systematic Palaeontology|volume=18|issue=6|pages=461–498|doi=10.1080/14772019.2019.1625078|s2cid=202018197}}</ref>
| [[File:Aquilarhinus LM.png|200px]]
|-
| ''[[Aquilops]]''
| 2014
| [[Cloverly Formation]] ([[Early Cretaceous]], [[Albian]])
| {{flag|United States}}<br />({{flag|Montana}})
| May have had a short horn protruding from its upper beak
| [[File:Aquilops NT small.jpg|200px]]
|-
| ''[[Ardetosaurus]]''
| 2024
| [[Morrison Formation]]  ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br /> ({{flag|Wyoming}})
| The holotype specimen was damaged by a museum fire
| [[File:Ardetosaurus viator (life restoration).png|200px]]
|-
| ''[[Arkansaurus]]''
| 2018
| [[Trinity Group]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Arkansas}})
| State dinosaur of Arkansas. Its generic name was in use informally even before its formal description
| [[File:Arkansaurus NT.jpg|200px]]
|-
| ''[[Arrhinoceratops]]''
| 1925
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Described as lacking a nasal horn although this is an artifact of preservation
| [[File:Arrhinoceratops BW.jpg|200px]]
|-
| ''[[Astrodon]]''
| 1865
| [[Antlers Formation]]?, [[Arundel Formation]] ([[Early Cretaceous]], [[Albian]])
| {{flag|United States}}<br />({{flag|Maryland}}<br />{{flag|Oklahoma}}?)
| State dinosaur of Maryland
| [[File:Astrodon johnstoni.jpg|200px]]
|-
| ''[[Astrophocaudia]]''
| 2012
| [[Trinity Group]] ([[Early Cretaceous]], [[Albian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Known from a single partial skeleton
| [[File:Astrophocaudia LM.png|200px]]
|-
| ''[[Atlantosaurus]]''
| 1877
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Colorado}})
| Potentially synonymous with ''[[Apatosaurus]],''<ref>Taylor, M.P. (2010). "Sauropod dinosaur research: a historical review." Pp. 361-386 in Moody, R.T.J., Buffetaut, E., Naish, D. and Martill, D.E. (eds.), ''Dinosaurs and Other Extinct Saurians: A Historical Perspective''. London: The Geological Society, Special Publication No. 34.</ref> but a referred species may represent a separate taxon<ref name=Atlantosaurus2>{{Cite journal | doi = 10.7717/peerj.857| title = A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda)| journal = PeerJ| volume = 3| pages = e857| year = 2015| last1 = Tschopp | first1 = E. | last2 = Mateus | first2 = O. V. | last3 = Benson | first3 = R. B. J. | pmid=25870766 | pmc=4393826| doi-access = free}}</ref> 
| [[File:Atlantosaurus montanus.jpg|200px]]
|-
| ''[[Atrociraptor]]''
| 2004
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Had a short, deep snout with enlarged teeth
| [[File:Atrociraptor.jpg|200px]]
|-
| ''[[Aublysodon]]''
| 1868
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Only known from teeth
| [[File:Aublysodon.jpg|200px]]
|-
| ''[[Augustynolophus]]''
| 2014
| [[Moreno Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|California}})
| State dinosaur of California. Originally named as a species of ''[[Saurolophus]]''
| [[File:Augustynolophus NT.jpg|200px]]
|-
| ''[[Avaceratops]]''
| 1986
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Lacked the fenestrae in its frill, a feature shared only with ''[[Triceratops]]''
| [[File:Avaceratops dinosaur.png|200px]]
|-
| ''[[Bambiraptor]]''
| 2000
| [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Small but well-preserved enough to display its mix of dinosaur- and bird-like features
| [[File:Bambiraptor reconstruction.jpg|200px]]
|-
| ''[[Barosaurus]]''
| 1890
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|South Dakota}}<br />{{flag|Utah}})
| Similar to ''[[Diplodocus]]'' but larger and with a longer neck
| [[File:Barosize.svg|200px]]
|-
| ''[[Bistahieversor]]''
| 2010
| [[Fruitland Formation]], [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Analysis of its braincase suggests it behaved like tyrannosaurids despite likely not being a member of that family<ref>{{Cite journal|last1=McKeown|first1=Matthew|last2=Brusatte|first2=Stephen L.|last3=Williamson|first3=Thomas E.|last4=Schwab|first4=Julia A.|last5=Carr|first5=Thomas D.|last6=Butler|first6=Ian B.|last7=Muir|first7=Amy|last8=Schroeder|first8=Katlin|last9=Espy|first9=Michelle A.|last10=Hunter|first10=James F.|last11=Losko|first11=Adrian S.|date=2020|title=Neurosensory and Sinus Evolution as Tyrannosauroid Dinosaurs Developed Giant Size: Insight from the Endocranial Anatomy of ''Bistahieversor sealeyi''|journal=The Anatomical Record|language=en|volume=303|issue=4|pages=1043–1059|doi=10.1002/ar.24374|pmid=31967416|s2cid=210871038|issn=1932-8494|url=https://www.pure.ed.ac.uk/ws/files/130139156/9._Brusatte.pdf|hdl=20.500.11820/8c657729-91df-4f7c-bca5-b9c469781768|hdl-access=free}}</ref>
| [[File:Bihastieversor NT.jpg|200px]]
|-
| ''[[Bisticeratops]]''
| 2022
| [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Preserves bite marks from a tyrannosaurid
| [[File:Bisticeratops Life Reconstruction.png|200px]]
|-
| ''[[Borealopelta]]''
| 2017
| [[Clearwater Formation]] ([[Early Cretaceous]], [[Albian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| So well-preserved that several osteoderms, keratin, pigments and stomach contents are preserved in the positions they would have been in while alive, without flattening or shriveling
| [[File:Borealopelta NT.jpg|200px]]
|-
| ''[[Boreonykus]]''
| 2015
| [[Wapiti Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| One of the few dromaeosaurids known from high latitudes
| [[File:Boreonykus LM.jpg|200px]]
|-
| ''[[Brachiosaurus]]''
| 1903
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Oklahoma}}<br />{{flag|Utah}}<br />{{flag|Wyoming}})
| A high browser with a tall chest and elongated forelimbs
| [[File:Brachiosaurus NT new.jpg|200px]]
|-
| ''[[Brachyceratops]]''
| 1914
| [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Only known from juvenile remains. One specimen has been found to represent a subadult ''[[Styracosaurus|Styracosaurus ovatus]]''
| [[File:Brachyceratops BW.jpg|200px]]
|-
| ''[[Brachylophosaurus]]''
| 1953
| [[Judith River Formation]], [[Oldman Formation]], [[Wahweap Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}}<br />{{flag|Utah}}?)
| Several specimens preserve extensive soft tissue remains
| [[File:Brachylophosaurus NT alternate.png|200px]]
|-
| ''[[Bravoceratops]]''
| 2013
| [[Javelina Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Suggested to have had a single small horn on the top of its frill but this may be inaccurate
| [[File:Bravoceratops skeletal.png|200px]]
|-
| ''[[Brontomerus]]''
| 2011
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Possessed an enlarged ilium which supported powerful leg muscles, which it may have used to kick away predators
| [[File:Brontomerus.jpg|200px]]
|-
| ''[[Brontosaurus]]''
| 1879
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Utah}}<br />{{flag|Wyoming}})
| Popularly associated with ''[[Apatosaurus]]'' but a 2015 study found enough differences for it to be classified as a separate genus<ref name=Atlantosaurus2 />
| [[File:Brontosaurus by Tom Parker.png|200px]]
|-
| ''[[Caenagnathus]]''
| 1940
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| One of the largest known caenagnathids<ref>G. F. Funston & P. J. Currie (2020) New material of Chirostenotes pergracilis (Theropoda, Oviraptorosauria) from the Campanian Dinosaur Park Formation of Alberta, Canada, Historical Biology, {{doi|10.1080/08912963.2020.1726908}}</ref>
| [[File:Caenagnathus mandible.jpg|200px]]
|-
| ''[[Camarasaurus]]''
| 1877
| [[Morrison Formation]], [[Summerville Formation]]? ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|New Mexico}}?<br />{{flag|Oklahoma}}?<br />{{flag|South Dakota}}?<br />{{flag|Utah}}<br />{{flag|Wyoming}})
| Very common and known from multiple specimens
| [[File:Camarasaurs1.jpg|200px]]
|-
| ''[[Camposaurus]]''
| 1998
| [[Bluewater Creek Formation]] ([[Late Triassic]], [[Norian]])
| {{flag|United States}}<br />({{flag|Arizona}})
| Potentially the oldest known neotheropod
| [[File:Camposaurus arizonensis.png|200px]]
|-
| ''[[Camptosaurus]]''
| 1885
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Utah}}<br />{{flag|Wyoming}})
| May have fed on tough vegetation as evidenced by extensive wear frequently exhibited on its teeth<ref>Foster, J. (2007). "''Camptosaurus dispar''." ''Jurassic West: The Dinosaurs of the Morrison Formation and Their World''. Indiana University Press. p. 219-221.</ref>
| [[File:Camptosaurus.jpg|200px]]
|-
| ''[[Caseosaurus]]''
| 1998
| [[Tecovas Formation]] ([[Late Triassic]], [[Norian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Possibly synonymous with ''[[Chindesaurus]]''
| [[File:Caseosaurus ilium.jpg|200px]]
|-
| ''[[Cedarosaurus]]''
| 1999
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| One specimen preserves over a hundred gastroliths<ref>{{cite book |author=Sanders, F. |author2=Manley, K. |author3=Carpenter, K. |editor=Tanke, Darren |editor2=Carpenter, Ken |chapter=Gastroliths from the Lower Cretaceous sauropod ''Cedarosaurus weiskopfae'' |title=Mesozoic Vertebrate Life: New Research Inspired by the Paleontology of Philip J. Currie |pages=[https://archive.org/details/mesozoicvertebra0000unse/page/166 166–180] |publisher=Indiana University Press |year=2001 |isbn=0-253-33907-3 |chapter-url=https://archive.org/details/mesozoicvertebra0000unse/page/166 }}</ref>
| [[File:Cedarosaurus SW.png|200px]]
|-
| ''[[Cedarpelta]]''
| 2001
| [[Cedar Mountain Formation]] ([[Late Cretaceous]], [[Cenomanian]] to [[Turonian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Lacked the extensive cranial ornamentation of later ankylosaurids
| [[File:Cedarpelta.jpg|200px]]
|-
| ''[[Cedrorestes]]''
| 2007
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Known from a partial skeleton. The specific name, ''crichtoni'', honors [[Michael Crichton]], author of ''[[Jurassic Park (novel)|Jurassic Park]]'' and ''[[The Lost World (Crichton novel)|The Lost World]]''
| [[File:Left ilium of Cedrorestes.png|200px]]
|-
| ''[[Centrosaurus]]''
| 1904
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Hundreds of individuals have been preserved in a single "mega-bonebed"<ref>D.A. Eberth, D.B. Brinkman, V. Barkas, "A centrosaurine mega-bonebed from the Upper Cretaceous of southern Alberta: Implications for behaviour and death events" in New Perspectives on Horned Dinosaurs: The Ceratopsian Symposium at the Royal Tyrrell Museum, September 2007 (2010).</ref>
| [[File:Centrosaurus.png|200px]]
|-
| ''[[Cerasinops]]''
| 2007
| [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Combines features of both Asian and North American basal ceratopsians
| [[File:Cerasinops BW.jpg|200px]]
|-
| ''[[Ceratops]]''
| 1888
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Although only known from a few bones, this genus is the namesake of the Ceratopsia and the Ceratopsidae
| [[File:Ceratops.jpg|200px]]
|-
| ''[[Ceratosaurus]]''
| 1884
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Utah}}<br />{{flag|Wyoming}})
| Possessed a row of osteoderms running down its back
| [[File:Ceratosaurus nasicornis DB.jpg|200px]]
|-
| ''[[Chasmosaurus]]''
| 1914
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Known from multiple remains, including various skulls
| [[File:Chasmosaurus BW.jpg|200px]]
|-
| ''[[Chindesaurus]]''
| 1995
| [[Chinle Formation]] ([[Late Triassic]], [[Norian]])
| {{flag|United States}}<br />({{flag|Arizona}})
| May be a herrerasaur or a close relative of ''[[Tawa hallae|Tawa]]''<ref>{{Cite journal|last1=Novas|first1=Fernando E.|last2=Agnolin|first2=Federico L.|last3=Ezcurra|first3=Martín D.|last4=Temp Müller|first4=Rodrigo|last5=Martinelli|first5=Agustín G.|last6=Langer|first6=Max C.|date=October 2021|title=Review of the fossil record of early dinosaurs from South America, and its phylogenetic implications|url=https://linkinghub.elsevier.com/retrieve/pii/S0895981121001887|journal=Journal of South American Earth Sciences|language=en|volume=110|page=103341|doi=10.1016/j.jsames.2021.103341|bibcode=2021JSAES.11003341N }}</ref> 
| [[File:Chindesaurus femur.png|200px]]
|-
| ''[[Chirostenotes]]''
| 1924
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Originally known only from isolated body parts
| [[File:Volant Chirostenotes.jpg|200px]]
|-
| ''[[Cionodon]]''
| 1874
| [[Denver Formation]], [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Colorado}})
| Poorly known
| [[File:Cionodon arctatus.jpg|200px]]
|-
| ''[[Citipes]]''
| 2020
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Some specimens were found as stomach contents of ''[[Gorgosaurus]]''<ref>{{cite journal |doi=10.1126/sciadv.adi0505 |title=Exceptionally preserved stomach contents of a young tyrannosaurid reveal an ontogenetic dietary shift in an iconic extinct predator |date=2023 |last1=Therrien |first1=François |last2=Zelenitsky |first2=Darla K. |last3=Tanaka |first3=Kohei |last4=Voris |first4=Jared T. |last5=Erickson |first5=Gregory M. |last6=Currie |first6=Philip J. |last7=Debuhr |first7=Christopher L. |last8=Kobayashi |first8=Yoshitsugu |journal=Science Advances |volume=9 |issue=49 |pages=eadi0505 |doi-access=free |pmid=38064561 |bibcode=2023SciA....9I.505T |pmc=10846869 }}</ref>
| [[File:Citipes elegans.jpg|200px]]
|-
| ''[[Claosaurus]]''
| 1890
| [[Niobrara Formation]] ([[Late Cretaceous]], [[Santonian]] to [[Campanian]])
| {{flag|United States}}<br />({{flag|Kansas}})
| Historically conflated with other hadrosaurs
| [[File:Kansas sea2DB.jpg|200px]]
|-
| ''[[Coahuilaceratops]]''
| 2010
| [[Cerro Huerta Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Mexico}}<br />({{flag|Coahuila}})
| Possessed brow horns comparable in size to those of ''[[Triceratops]]'' and ''[[Torosaurus]]'' 
| [[File:Life reconstruction of Coahuilaceratops (cropped).png|200px]]
|-
| ''[[Coahuilasaurus]]''
| 2024
| [[Cerro del Pueblo Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Mexico}}<br /> ({{flag|Coahuila}})
| Identified as a specimen of ''[[Kritosaurus]]''<ref> {{cite journal|last1=Ramírez-Velasco|first1=Angel Alejandro|year=2022|title=Phylogenetic and biogeography analysis of Mexican hadrosauroids|journal=Cretaceous Research|volume=138|at=105267|bibcode=2022CrRes.13805267R|doi=10.1016/j.cretres.2022.105267|s2cid=249559319}}</ref> before receiving its own genus name<ref> {{cite journal|last1=Longrich|first1=N.R.|last2=Ramirez Velasco|first2=A.A.|last3=Kirkland|first3=J.|last4=Bermúdez Torres|first4=A.E.|last5=Serrano-Brañas|first5=C.I.|year=2024|title=''Coahuilasaurus lipani'', a New Kritosaurin Hadrosaurid from the Upper Campanian Cerro del Pueblo Formation, Northern Mexico|journal=Diversity|volume=16|issue=9|page=531|doi=10.3390/d16090531|doi-access=free }}</ref>
| [[File:Life reconstruction of Coahuilasaurus.png|200px]]
|-
| ''[[Coelophysis]]''
| 1889
| [[Chinle Formation]] ([[Late Triassic]], [[Norian]])
| {{flag|United States}}<br />({{flag|Arizona}}<br />{{flag|New Mexico}})
| Known from over a thousand specimens, making it one of the most well-known early dinosaurs. Some referred species may belong to their own genera
| [[File:Coelophysis size.jpg|200px]]
|-
| ''[[Coelurus]]''
| 1879
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| Potentially an early member of the tyrannosauroid lineage<ref>{{cite journal|doi=10.7717/peerj.1032|pmid=26157616|pmc=4476167|title=The phylogenetic affinities of the bizarre Late Cretaceous Romanian theropod ''Balaur bondoc'' (Dinosauria, Maniraptora): Dromaeosaurid or flightless bird?|journal=PeerJ|volume=3|pages=e1032|year=2015|last1=Cau|first1=Andrea|last2=Brougham|first2=Tom|last3=Naish|first3=Darren |doi-access=free }}</ref>
| [[File:Coelurus BW.jpg|200px]]
|-
| ''[[Colepiocephale]]''
| 2003
| [[Foremost Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Originally described as a species of ''[[Stegoceras]]''
| [[File:Colepiocephale lambei.png|200px]]
|-
| ''[[Convolosaurus]]''
| 2019
| [[Twin Mountains Formation]] ([[Early Cretaceous]], [[Aptian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Before its formal description, it had been informally referred to as the "[[Proctor Lake]] hypsilophodontid"
| [[File:3d model Convolosaurus marri.png|200px]]
|-
| ''[[Coronosaurus]]''
| 2012
| [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Had irregular masses of small spikes on the very top of its frill
| [[File:Coronosaurus NT small.jpg|200px]]
|-
| ''[[Corythosaurus]]''
| 1914
| [[Dinosaur Park Formation]], [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Possessed a semicircular crest which may have been used for vocalization
| [[File:Life reconstruction of Corythosaurus casuarius.png|200px]]
|-
| ''[[Crittendenceratops]]''
| 2018
| [[Fort Crittenden Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Arizona}})
| The youngest known member of the Nasutoceratopsini
| [[File:Crittendenceratops shaded.jpg|200px]]
|-
| ''[[Daemonosaurus]]''
| 2011
| [[Chinle Formation]] ([[Late Triassic]], [[Norian]] to [[Rhaetian]]?)
| {{flag|United States}}<br />({{flag|New Mexico}})
| Unique among early dinosaurs for possessing a short snout with long teeth
| [[File:Daemonosaurus chauliodus.jpg|200px]]
|-
| ''[[Dakotadon]]''
| 2008
| [[Lakota Formation]] ([[Early Cretaceous]], [[Barremian]])
| {{flag|United States}}<br />({{flag|South Dakota}})
| Originally named as a species of ''[[Iguanodon]]''
| [[File:Dakotadon restoration.png|200px]]
|-
| ''[[Dakotaraptor]]''
| 2015
| [[Hell Creek Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|South Dakota}})
| The holotype assemblage may represent a chimera of multiple taxa<ref>{{Cite journal|last1=Jasinski|first1=Steven E.|last2=Sullivan|first2=Robert M.|last3=Dodson|first3=Peter|date=2020-03-26|title=New Dromaeosaurid Dinosaur (Theropoda, Dromaeosauridae) from New Mexico and Biodiversity of Dromaeosaurids at the end of the Cretaceous|journal=[[Scientific Reports]]|volume=10|issue=1|page=5105|doi=10.1038/s41598-020-61480-7|pmid=32218481|pmc=7099077|bibcode=2020NatSR..10.5105J|issn=2045-2322|doi-access=free}}</ref>
| [[File:Dakotaraptor wiki.jpg|200px]]
|-
| ''[[Daspletosaurus]]''
| 1970
| [[Dinosaur Park Formation]], [[Judith River Formation]], [[Oldman Formation]], [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| At least three species are known. These have been interpreted as forming an anagenetic lineage<ref>{{Cite journal |last1=Warshaw |first1=Elías A.|last2=Fowler |first2=Denver W. |year=2022 |title=A transitional species of ''Daspletosaurus'' Russell, 1970 from the Judith River Formation of eastern Montana |journal=[[PeerJ]] |volume=10 |at=e14461 |doi=10.7717/peerj.14461 |pmid=36452080 |pmc=9703990 |doi-access=free}}</ref> but this hypothesis has been criticized<ref name=Daspletosaurus>{{Cite journal |last1=Scherer |first1=Charlie Roger |last2=Voiculescu-Holvad |first2=Christian |year=2024 |title=Re-analysis of a dataset refutes claims of anagenesis within ''Tyrannosaurus''-line tyrannosaurines (Theropoda, Tyrannosauridae) |journal=[[Cretaceous Research]] |volume=155 |at=105780 |doi=10.1016/j.cretres.2023.105780 |issn=0195-6671|doi-access=free }}</ref>
| [[File:Daspletosaurus torosus steveoc.jpg|200px]]
|-
| ''[[Deinonychus]]''
| 1969
| [[Antlers Formation]], [[Arundel Formation]]?, [[Cedar Mountain Formation]]?, [[Cloverly Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Maryland}}?<br />{{flag|Montana}}<br />{{flag|Oklahoma}}<br />{{flag|Utah}}?<br />{{flag|Wyoming}})
| Its discovery helped researchers realize that dinosaurs were active, warm-blooded animals, kicking off the [[Dinosaur Renaissance]]
| [[File:Deinonychus ewilloughby.png|200px]]
|-
| ''[[Denversaurus]]''
| 1988
| [[Lance Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|South Dakota}}<br />{{flag|Wyoming}})
| The youngest known nodosaurid<ref>Bakker, R.T. (1988). "Review of the Late Cretaceous nodosauroid Dinosauria: ''Denversaurus schlessmani'', a new armor-plated dinosaur from the Latest Cretaceous of South Dakota, the last survivor of the nodosaurians, with comments on Stegosaur-Nodosaur relationships". ''Hunteria'' '''1'''(3): 1-23.(1988).</ref>
| [[File:Denversaurus schlessmani scale.png|200px]]
|-
| ''[[Diabloceratops]]''
| 2010
| [[Wahweap Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Had a distinctively short, deep skull
| [[File:Diabloceratops UDL.png|200px]]
|-
| ''[[Diclonius]]''
| 1876
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Replaced its teeth in such a way that new teeth could be used at the same time as older ones
|
|-
| ''[[Dilophosaurus]]''
| 1970
| [[Kayenta Formation]] ([[Early Jurassic]], [[Sinemurian]] to [[Toarcian]])
| {{flag|United States}}<br />({{flag|Arizona}})
| Possessed two semicircular crests running along the length of the skull
| [[File:Dilophosaurus with nest.png|200px]]
|-
| ''[[Dineobellator]]''
| 2020
| [[Ojo Alamo Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Several features of its hands and feet may be adaptations for increased grip strength<ref>{{cite journal|last1=Jasinski|first1=S. E.|last2=Sullivan|first2=R. M.|last3=Dodson|first3=P.|date=2020|title=New Dromaeosaurid Dinosaur (Theropoda, Dromaeosauridae) from New Mexico and Biodiversity of Dromaeosaurids at the end of the Cretaceous|journal=Scientific Reports|volume=10|issue=1|page=5105|doi=10.1038/s41598-020-61480-7|pmid=32218481|pmc=7099077|bibcode=2020NatSR..10.5105J |issn=2045-2322|doi-access=free}}</ref>
| [[File:Dineobellator notohesperus NT.jpg|200px]]
|-
| ''[[Diplodocus]]''
| 1878
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]]?)
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Montana}}<br />{{flag|New Mexico}}<br />{{flag|Utah}}<br />{{flag|Wyoming}})
| Had a long, thin tail. Popularly thought to have been used like a bullwhip<ref>{{cite journal | last1 = Myhrvold | first1 = Nathan P.  | year = 1997 | title = Supersonic sauropods? Tail dynamics in the diplodocids | journal = Paleobiology | volume = 23 | issue = 4 | pages = 393–409  | doi = 10.1017/S0094837300019801  | bibcode = 1997Pbio...23..393M | s2cid = 83696153 | url = http://doc.rero.ch/record/15579/files/PAL_E1438.pdf }}</ref> but it is possible that it could not handle the stress of supersonic travel<ref>{{cite journal | vauthors = Conti S, Tschopp E, Mateus O, Zanoni A, Masarati P, Sala G | title = Multibody analysis and soft tissue strength refute supersonic dinosaur tail | journal = Scientific Reports | volume = 12 | issue = 1 | at = 19245 | year = 2022 | pmid = 36482175 | pmc = 9732322 | doi = 10.1038/s41598-022-21633-2 | doi-access = free }}</ref>
| [[File:Diplodocus carnegii.jpg|200px]]
|-
| ''[[Diplotomodon]]''
| 1868
| [[Hornerstown Formation]]?/[[Navesink Formation]]? ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|New Jersey}})
| Has been suggested to be non-dinosaurian
| [[File:Diplotomodon.jpg|200px]]
|-
| ''[[Dromaeosaurus]]''
| 1922
| [[Dinosaur Park Formation]], [[Hell Creek Formation]]?, [[Horseshoe Canyon Formation]]?, [[Prince Creek Formation]]? ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]]?)
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Alaska}}?<br />{{flag|South Dakota}}?)
| Analysis of wear on its teeth suggests it preferred tougher prey, including bone
| [[File:Dromaeosaurus Restoration.png|200px]]
|-
| ''[[Dromiceiomimus]]''
| 1972
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| May be synonymous with ''[[Ornithomimus|Ornithomimus edmontonicus]]''
| [[File:Dromiceiomimus 03747.JPG|200px]]
|-
| ''[[Dryosaurus]]''
| 1894
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Utah}}<br />{{flag|Wyoming}})
| Remains of multiple growth stages have been found, including specimens in embryonic age<ref>{{cite journal | title=Small bones of the hypsilophodontid dinosaur Dryosaurus altus from the Upper Jurassic of Colorado | last1=Galton | first1=Peter M. | last2=Jensen | first2=James A. | journal=The Great Basin Naturalist | volume=33 | issue=22 | pages=129–132|jstor = 41711378|year = 1973}}</ref>
| [[File:DryosaurusNV.jpg|200px]]
|-
| ''[[Dryptosaurus]]''
| 1877
| [[Navesink Formation]]?, [[New Egypt Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|New Jersey}})
| Its discovery showed that theropods were bipedal animals
| [[File:Dryptosaurus by Durbed.jpg|200px]]
|-
| ''[[Dynamoterror]]''
| 2018
| [[Menefee Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Part of the Teratophoneini, a clade of tyrannosaurids exclusively known from southwestern North America<ref name=Daspletosaurus />
| [[File:Dynamoterror right frontal in dorsal and ventral views.png|200px]]
|-
| ''[[Dyoplosaurus]]''
| 1924
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| The holotype specimen preserves skin impressions<ref>{{Cite journal | last1 = Arbour | first1 = V. M. | last2 = Burns | first2 = M. E. | last3 = Sissons | first3 = R. L. | doi = 10.1671/039.029.0405 | title = A redescription of the ankylosaurid dinosaur ''Dyoplosaurus acutosquameus'' Parks, 1924 (Ornithischia: Ankylosauria) and a revision of the genus | journal = Journal of Vertebrate Paleontology | volume = 29 | issue = 4 | page = 1117 | year = 2009 | bibcode = 2009JVPal..29.1117A | s2cid = 85665879 }}</ref>
| [[File:Dyoplosaurus.tif|200px]]
|-
| ''[[Dysganus]]''
| 1876
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Four species have been named, all from isolated teeth
|
|-
| ''[[Dyslocosaurus]]''
| 1992
| [[Lance Formation]]?/[[Morrison Formation]]? ([[Late Jurassic]], [[Kimmeridgian]]?/[[Late Cretaceous]], [[Maastrichtian]]?)
| {{flag|United States}}<br />({{flag|Wyoming}})
| Has been suggested to have four claws on its hindlimbs
| [[File:Dyslocosaurus polyonychius.jpg|200px]]
|-
| ''[[Dystrophaeus]]''
| 1877
| [[Morrison Formation]] ([[Late Jurassic]], [[Oxfordian (stage)|Oxfordian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Inconsistent in phylogenetic placement, although undescribed remains could further clarify its relationships
| [[File:Pube di Dystrophaeus.jpg|200px]]
|-
| ''[[Edmontonia]]''
| 1928
| [[Dinosaur Park Formation]], [[Horseshoe Canyon Formation]], [[Judith River Formation]]? ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}}?)
| Possessed forward-pointing, bifurcated spikes on its shoulders
| [[File:Edmontonia rugosidens.png|200px]]
|-
| ''[[Edmontosaurus]]''
| 1917
| [[Frenchman Formation]], [[Hell Creek Formation]], [[Horseshoe Canyon Formation]], [[Lance Formation]], [[Prince Creek Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}}<br />{{flag|Saskatchewan}})<br />{{flag|United States}}<br />({{flag|Alaska}}<br />{{flag|Colorado}}<br />{{flag|Montana}}<br />{{flag|North Dakota}}<br />{{flag|South Dakota}}<br />{{flag|Wyoming}})
| Known from multiple well-preserved specimens, including a few "mummies". Several were originally assigned to their own genera and/or species
| [[File:Edmontosaurus sp. reconstruction.PNG|200px]]
|-
| ''[[Einiosaurus]]''
| 1994
| [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Distinguished by its forward-curving nasal horn
| [[File:Einiosaurus BW.jpg|200px]]
|-
| ''[[Eolambia]]''
| 1998
| [[Cedar Mountain Formation]] ([[Late Cretaceous]], [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Remains of multiple individuals are known, making up much of the skeleton
| [[File:Eolambia cropped.png|200px]]
|-
| ''[[Eoneophron]]''
| 2024
| [[Hell Creek Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br /> ({{flag|South Dakota}})
| Smaller than the contemporary ''[[Anzu wyliei|Anzu]]''
| [[File:Eoneophron infernalis.png|200px]]
|-
| ''[[Eotrachodon]]''
| 2016
| [[Mooreville Chalk]] ([[Late Cretaceous]], [[Santonian]])
| {{flag|United States}}<br />({{flag|Alabama}})
| Had a saurolophine-like skull despite its basal position<ref>{{cite journal |last1=Prieto-Marquez |first1=Albert |last2=Erickson |first2=Gregory M. |last3=Ebersole |first3=Jun A. |title=A primitive hadrosaurid from southeastern North America and the origin and early evolution of 'duck-billed' dinosaurs |journal=[[Journal of Vertebrate Paleontology]] |volume = 36|issue = 2|year=2016 |pages=e1054495 |doi=10.1080/02724634.2015.1054495 |bibcode=2016JVPal..36E4495P |s2cid=86032549 |url=https://figshare.com/articles/dataset/A_primitive_hadrosaurid_from_southeastern_North_America_and_the_origin_and_early_evolution_of_8216_duck_billed_8217_dinosaurs/1632849 }}</ref>
| [[File:Eotrachodon NT small.jpg|200px]]
|-
| ''[[Eotriceratops]]''
| 2007
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| May have been the largest known ceratopsid
| [[File:Eotriceratops BW.jpg|200px]]
|-
| ''[[Epichirostenotes]]''
| 2011
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Its discovery allowed researchers to connect isolated caenagnathid body parts to each other
| [[File:Epichirostenotes.jpg|200px]]
|-
| ''[[Euoplocephalus]]''
| 1910
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Unusually, its [[palpebral bone]] was mobile, allowing it to be used as an eyelid<ref>{{cite journal|author=Coombs W.|year=1972|title=The Bony Eyelid of ''Euoplocephalus'' (Reptilia, Ornithischia)|journal=Journal of Paleontology|volume=46|issue=5|pages=637–50|jstor=1303019}}.</ref>
| [[File:Euoplocephalus BW.jpg|200px]]
|-
| ''[[Falcarius]]''
| 2005
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Transitional between generalized theropods and specialized therizinosaurs
| [[File:Falcarius Restoration.png|200px]]
|-
| ''[[Ferrisaurus]]''
| 2019
| [[Tango Creek Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|British Columbia}})
| Its holotype was discovered close to a railway line<ref>{{cite journal|last1=Arbour|first1=V. M.|last2=Evans|first2=D. C.|date=2019|title=A new leptoceratopsid dinosaur from Maastrichtian-aged deposits of the Sustut Basin, northern British Columbia, Canada|journal=PeerJ|volume=7|pages=e7926|doi=10.7717/peerj.7926|doi-access=free|pmc=6842559|pmid=31720103}}</ref>
| [[File:Ferrisaurus life restoration.jpg|200px]]
|-
| ''[[Fona]]''
| 2024
| [[Cedar Mountain Formation]] ([[Late Cretaceous]], [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Possibly a semi-fossorial animal based on the related ''[[Oryctodromeus]]''<ref name="Fona">{{Cite journal |last1=Avrahami |first1=Haviv M. |last2=Makovicky |first2=Peter J. |last3=Tucker |first3=Ryan T. |last4=Zanno |first4=Lindsay E. |date=2024-07-09 |title=A new semi-fossorial thescelosaurine dinosaur from the Cenomanian-age Mussentuchit Member of the Cedar Mountain Formation, Utah |journal=[[The Anatomical Record]] |language=en |doi=10.1002/ar.25505 |issn=1932-8486 |pmid=38979930 |doi-access=free}}</ref>
| [[File:Fona herzogae.png|200px]]
|-
| ''[[Foraminacephale]]''
| 2016
| [[Dinosaur Park Formation]], [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Originally assigned to three different pachycephalosaurid genera
| [[File:Foraminacephale.png|200px]]
|-
| ''[[Fosterovenator]]''
| 2014
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| Has been variously described as a ceratosaurid, a tetanuran or a close relative of ''[[Elaphrosaurus]]''<ref>{{cite journal|first=S.G.|last=Dalman|year=2014|title=New data on small theropod dinosaurs from the Upper Jurassic Morrison Formation of Como Bluff, Wyoming, USA|journal=Volumina Jurassica|volume=12|issue=2|pages=181–196|url=http://31.186.81.235:8080/api/files/view/36855.pdf}}</ref> 
| [[File:Fosterovenator fíbula.jpg|200px]]
|-
| ''[[Fruitadens]]''
| 2010
| [[Morrison Formation]] ([[Late Jurassic]], [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}})
| One of the smallest known ornithischians<ref>{{cite journal |last1=Butler |first1=Richard J. |last2=Galton |first2=Peter M. |last3=Porro |first3=Laura B. |last4=Chiappe |first4=Luis M. |last5=Henderson |first5=D. M. |last6=Erickson |first6=Gregory M. |year=2010 |title=Lower limits of ornithischian dinosaur body size inferred from a new Upper Jurassic heterodontosaurid from North America |journal=Proceedings of the Royal Society B |volume=277 |issue=1680 |pages=375–381 |doi=10.1098/rspb.2009.1494 |pmc=2842649 |pmid=19846460}}</ref>
| [[File:Fruitadens.jpg|200px]]
|-
| ''[[Furcatoceratops]]''
| 2023
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Preserves most of the postcranial skeleton, a rarity for ceratopsids. Remains originally identified as ''[[Avaceratops]]''
| [[File:Furcatoceratops UDL.png|200px]]
|-
| ''[[Galeamopus]]''
| 2015
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Wyoming}})
| One specimen is nearly complete, even preserving an associated skull
| [[File:Galeamopus.jpg|200px]]
|-
| ''[[Gargoyleosaurus]]''
| 1998
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| Combines features of both ankylosaurids and nodosaurids
| [[File:Gargoyle.png|200px]]
|-
| ''[[Gastonia (dinosaur)|Gastonia]]''
| 1998
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Several concentrations of fossils may suggest this taxon lived in herds<ref>{{cite journal | last1 = Kinneer | first1 = B. | last2 = Carpenter | first2 = K. | last3 = Shaw | first3 = A. | title = Redescription of Gastonia burgei (Dinosauria: Ankylosauria, Polacanthidae), and description of a new species | journal = Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen | volume = 282 | issue = 1 | pages = 37–80 | date = 2016 | doi=10.1127/njgpa/2016/0605}}</ref>
| [[File:Gastonia burgei dinosaur.png|200px]]
|-
| ''[[Geminiraptor]]''
| 2010
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| The proportions of its maxilla are similar to those of Late Cretaceous troodontids
| [[File:Geminiraptor NT.jpg|200px]]
|-
| ''[[Glishades]]''
| 2010
| [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}}
| Described as a basal hadrosauroid but may in fact be a juvenile saurolophine hadrosaurid<ref>{{Cite journal |author1=Nicolás E. Campione |author2=Kirstin S. Brink |author3=Elizabeth A. Freedman |author4=Christopher T. McGarrity |author5=David C. Evans |year=2012 |title=''Glishades ericksoni'', an indeterminate juvenile hadrosaurid from the Two Medicine Formation of Montana: implications for hadrosauroid diversity in the latest Cretaceous (Campanian-Maastrichtian) of western North America |journal=Palaeobiodiversity and Palaeoenvironments |volume=in press |doi=10.1007/s12549-012-0097-1|s2cid=128568454 }}</ref>
|
|-
| ''[[Glyptodontopelta]]''
| 2000
| [[Ojo Alamo Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Originally interpreted as possessing a flat mosaic of osteoderms similar to the shields of glyptodonts
| [[File:Glyptodontopelta mima profile reconstruction.jpg|200px]]
|-
| ''[[Gojirasaurus]]''
| 1997
| [[Bull Canyon Formation]] ([[Late Triassic]], [[Norian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| May be a chimera consisting of undiagnostic theropod bones mixed with pseudosuchian vertebrae<ref>Nesbitt, Irmis and Parker (2007). "A critical re-evaluation of the Late Triassic dinosaur taxa of North America." ''Journal of Systematic Palaeontology'', '''5''' (#2): 209–243.</ref>
| [[File:Gojirasaurus BW.jpg|200px]]
|-
| ''[[Gorgosaurus]]''
| 1914
| [[Dinosaur Park Formation]], [[Judith River Formation]]?, [[Two Medicine Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}}?)
| Dozens of specimens are known
| [[File:Gorgosaurus 2022 Life Reconstruction.png|200px]]
|-
| ''[[Gravitholus]]''
| 1979
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Potentially synonymous with ''[[Stegoceras]]''<ref>{{Cite journal |last1=Dyer |first1=Aaron D. |last2=Powers |first2=Mark J. |last3=Currie |first3=Philip J. |date=2023 |title=Problematic putative pachycephalosaurids: Synchrotron µCT imaging shines new light on the anatomy and taxonomic validity of ''Gravitholus albertae'' from the Belly River Group (Campanian) of Alberta, Canada |url=https://journals.library.ualberta.ca/vamp/index.php/VAMP/article/view/29388 |journal=Vertebrate Anatomy Morphology Palaeontology |language=en |volume=10 |issue=1 |pages=65–110 |doi=10.18435/vamp29388 |issn=2292-1389|doi-access=free }}</ref>
| [[File:Gravitholus.png|200px]]
|-
| ''[[Gremlin slobodorum|Gremlin]]''
| 2023
| [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Possessed a ridge running along the top of the skull
| [[File:Gremlin UDL.png|200px]]
|-
| ''[[Gryphoceratops]]''
| 2012
| [[Milk River Formation]] ([[Late Cretaceous]], [[Santonian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Potentially the smallest adult ceratopsian known from North America
| [[File:Gryphoceratops morrisoni.png|200px]]
|-
| ''[[Gryposaurus]]''
| 1914
| [[Bearpaw Formation]]?, [[Dinosaur Park Formation]], [[Javelina Formation]]?, [[Kaiparowits Formation]], [[Two Medicine Formation]] ([[Late Cretaceous]], [[Santonian]] to [[Maastrichtian]]?)
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}}<br />{{flag|Texas}}?<br />{{flag|Utah}})
| One specimen preserves impressions of a row of pyramidal scales running along its back<ref>{{cite book |last=Lull |first=Richard Swann |author-link=Richard Swann Lull |author2=Wright, Nelda E. |title=Hadrosaurian Dinosaurs of North America |year=1942 |publisher=Geological Society of America |series=Geological Society of America Special Paper '''40''' |pages=110–117}}</ref>
| [[File:Gryposaurus notabilis.png|200px]]
|-
| ''[[Hadrosaurus]]''
| 1858
| [[Woodbury Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Jersey}})
| Its holotype was the first dinosaur skeleton to be mounted
| [[File:Hadrosaurus foulkii restoration.png|200px]]
|-
| ''[[Hagryphus]]''
| 2005
| [[Kaiparowits Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Large but only known from a single hand
| [[File:Hagryphus2.jpg|200px]]
|-
| ''[[Hanssuesia]]''
| 2003
| [[Dinosaur Park Formation]], [[Judith River Formation]], [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| One dome preserves several lesions
| [[File:Hanssuesia sternbergi.jpg|200px]]
|-
| ''[[Haplocanthosaurus]]''
| 1903
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Montana}}?<br />{{flag|Wyoming}})
| One of the smallest sauropods of the Morrison Formation
| [[File:Haplocanthosaurus.jpg|200px]]
|-
| ''[[Hesperonychus]]''
| 2009
| [[Dinosaur Park Formation]], [[Oldman Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| A common component of its habitat as indicated by the great number of its remains
| [[File:Hesperonychus elizabethae pelvis by Nick Longrich.jpg|200px]]
|-
| ''[[Hesperornithoides]]''
| 2019
| [[Morrison Formation]] ([[Late Jurassic]], [[Oxfordian (stage)|Oxfordian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| Before its formal description, it had been nicknamed "Lori"
| [[File:Hesperornithoides.png|200px]]
|-
| ''[[Hesperosaurus]]''
| 2001
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Montana}}<br />{{flag|Wyoming}})
| Two morphotypes of plates are known, which has been interpreted as an indication of [[sexual dimorphism]]<ref>{{cite journal|author=Saitta, E.T.|date=2015|title=Evidence for Sexual Dimorphism in the Plated Dinosaur ''Stegosaurus mjosi'' (Ornithischia, Stegosauria) from the Morrison Formation (Upper Jurassic) of Western USA|journal=PLOS ONE|volume=10|issue=4|doi=10.1371/journal.pone.0123503|pmid=25901727|pmc=4406738|bibcode=2015PLoSO..1023503S|at=e0123503|doi-access=free}}</ref>
| [[File:Hesperosaurus restoration.jpg|200px]]
|-
| ''[[Hierosaurus]]''
| 1909
| [[Niobrara Formation]] ([[Late Cretaceous]], [[Coniacian]] to [[Campanian]])
| {{flag|United States}}<br />({{flag|Kansas}})
| Only known from a few bones, including osteoderms
| [[File:Hierosaurus sternbergi.jpg|200px]]
|-
| ''[[Hippodraco]]''
| 2010
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Its tooth crowns were shaped like shields
| [[File:Hippodraco restoration.png|200px]]
|-
| ''[[Hoplitosaurus]]''
| 1902
| [[Lakota Formation]] ([[Early Cretaceous]], [[Barremian]]?)
| {{flag|United States}}<br />({{flag|South Dakota}})
| Known from some osteoderms, including spikes similar to those of ''[[Polacanthus]]''
| [[File:Hoplitosaurus marshi.jpg|200px]]
|-
| ''[[Huehuecanauhtlus]]''
| 2012
| Unnamed formation ([[Late Cretaceous]], [[Santonian]])
| {{flag|Mexico}}<br />({{flag|Michoacán}})
| The southernmost non-hadrosaurid hadrosauroid known from North America<ref>{{Cite journal|author1=Angel Alejandro Ramírez-Velasco |author2=Mouloud Benammi |author3=Albert Prieto-Márquez |author4=Jesús Alvarado Ortega |author5=René Hernández-Rivera |year=2012 |title=''Huehuecanauhtlus tiquichensis'', a new hadrosauroid dinosaur (Ornithischia: Ornithopoda) from the Santonian (Late Cretaceous) of Michoacán, Mexico |journal=Canadian Journal of Earth Sciences |volume=49 |issue=2 |pages=379–395 |doi=10.1139/e11-062 |bibcode=2012CaJES..49..379R |url=http://www.nrcresearchpress.com/doi/abs/10.1139/e11-062 }}</ref>
| [[File:Huehuecanauhtlus tiquichensis copia.jpg|200px]]
|-
| ''[[Hypacrosaurus]]''
| 1913
| [[Horseshoe Canyon Formation]], [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| Some juveniles of this genus were originally interpreted as dwarf lambeosaurines
| [[File:Life reconstruction of Hypacrosaurus altispinus.png|200px]]
|-
| ''[[Hypsibema]]''
| 1869
| [[Marshalltown Formation]]?, [[Ripley Formation]], [[Tar Heel/Coachman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Missouri}}<br />{{flag|New Jersey}}?<br />{{flag|North Carolina}})
| Potentially one of the largest non-hadrosaurid hadrosauroids
| [[File:HypsibemaCrassicaudaVertNC.jpg|200px]]
|-
| ''[[Hypsirhophus]]''
| 1878
| [[Morrison Formation]] ([[Late Jurassic]], [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}})
| Usually seen as synonymous with ''[[Stegosaurus]]'' but may be a separate genus due to differences in its vertebrae<ref>{{cite journal|author=Galton, P.M.|year=2010|title=Species of plated dinosaur ''Stegosaurus'' (Morrison Formation, Late Jurassic) of western USA: new type species designation needed|journal=[[Swiss Journal of Geosciences]]|volume=103|issue=2|pages=187–198|doi=10.1007/s00015-010-0022-4|s2cid=140688875|doi-access=free}}</ref>
| [[File:Hypsirhophus discurus.png|200px]]
|-
| ''[[Iani]]''
| 2023
| [[Cedar Mountain Formation]] ([[Late Cretaceous]], [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Represents the family Tenontosauridae, a North American clade of rhabdodontomorphs<ref name=Iani>{{Cite journal | last1=Zanno | first1=Lindsay E. | last2=Gates | first2=Terry A. | last3=Ayrahami | first3=Haviv M. | last4=Tucker | first4=Ryan T. | last5=Makovicky | first5=Peter J. |title=An early-diverging iguanodontian (Dinosauria: Rhabdodontomorpha) from the Late Cretaceous of North America |journal=PLOS ONE |year=2023 |volume=18 |issue=6 |at=e0286042 |doi=10.1371/journal.pone.0286042 | pmid=37285376 | pmc=10246810 |doi-access=free }}</ref>
| [[File:Iani UDL.png|200px]]
|-
| ''[[Iguanacolossus]]''
| 2010
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Large and robustly built
| [[File:Life restoration of Iguanacolossus.jpg|200px]]
|-
| ''[[Invictarx]]''
| 2018
| [[Menefee Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Only known from a few bones but can be distinguished from other genera by characters of its osteoderms
| [[File:Invictarx zephyri, white background.jpg|200px]]
|-
| ''[[Issi]]''
| 2021
| [[Fleming Fjord Formation]] ([[Late Triassic]], [[Norian]])
| {{flag|Greenland}}<br />([[Sermersooq]])
| Originally described as an exemplar of ''[[Plateosaurus]]''
| [[File:Issi saaneq.png|200px]]
|-
| ''[[Jeyawati]]''
| 2010
| [[Moreno Hill Formation]] ([[Late Cretaceous]], [[Turonian]] to [[Coniacian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Its [[postorbital]] bone had a rugose texture
| [[File:Jeyawati NT.jpg|200px]]
|-
| ''[[Judiceratops]]''
| 2013
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Unusually, its brow horns were teardrop-shaped in cross-section
| [[File:Judiceratops tigris by Nick Longrich.jpg|200px]]
|-
| ''[[Kaatedocus]]''
| 2012
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| Originally interpreted as a diplodocid although one study finds it to be more likely a basal dicraeosaurid<ref name=Kaatedocus>{{Cite journal|author1=John A. Whitlock |author2=Jeffrey A. Wilson Mantilla |year=2020 |title=The Late Jurassic sauropod dinosaur ''{{'}}Morosaurus{{'}} agilis'' Marsh, 1889 reexamined and reinterpreted as a dicraeosaurid |journal=Journal of Vertebrate Paleontology |volume=40 |issue=6 |pages=e1780600 |doi=10.1080/02724634.2020.1780600 |bibcode=2020JVPal..40E0600W |doi-access=free }}</ref>
| [[File:Kaatedocus skull.png|200px]]
|-
| ''[[Kayentavenator]]''
| 2010
| [[Kayenta Formation]] ([[Early Jurassic]], [[Sinemurian]] to [[Pliensbachian]])
| {{flag|United States}}<br />({{flag|Arizona}})
| Described in a book published through an online print-on-demand service
| [[File:Kayentavenator.jpg|200px]]
|-
| ''[[Koparion]]''
| 1994
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Known from a single tooth which may have come from a troodontid
| [[File:Koparion NT.jpg|200px]]
|-
| ''[[Kosmoceratops]]''
| 2010
| [[Kaiparowits Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Possessed fifteen horns and horn-like structures, including eight hornlets folding down from the top of the frill
| [[File:Kosmoceratops NT small.jpg|200px]]
|-
| ''[[Kritosaurus]]''
| 1910
| [[El Picacho Formation]]?, [[Javelina Formation]]?, [[Kirtland Formation]], [[Ojo Alamo Formation]]? ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]]?)
| {{flag|United States}}<br />({{flag|New Mexico}}<br />{{flag|Texas}}?)
| Had an elevated nasal bone with an enlarged nasal cavity to match
| [[File:Kritosaurus navajovius.png|200px]]
|-
| ''[[Labocania]]''
| 1974
| [[Cerro del Pueblo Formation]], [[La Bocana Roja Formation]] ([[Late Cretaceous]], [[Cenomanian]]? to [[Campanian]])
| {{flag|Mexico}}<br />({{flag|Baja California}}<br />{{flag|Coahuila}})
| The description of the second species, ''L. aguillonae'', suggests a position within the tyrannosaurid clade Teratophoneini<ref name="L.aguillonae">{{Cite journal|last1=Rivera-Sylva |first1=Héctor E. |last2=Longrich |first2=Nicholas R. |title=A New Tyrant Dinosaur from the Late Campanian of Mexico Reveals a Tribe of Southern Tyrannosaurs |year=2024 |journal=Fossil Studies |volume=2 |issue=4 |pages=245–272 |doi=10.3390/fossils2040012 |doi-access=free }}</ref>
| [[File:Labocania color.jpg|200px]]
|-
| ''[[Lambeosaurus]]''
| 1923
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Possessed a hollow head crest that varied in shape between species, sexes and ages. Most familiarly, it was hatchet-shaped in adult male ''L. lambei''
| [[File:Life reconstruction of Lambeosaurus lambei.png|200px]]
|-
| ''[[Laosaurus]]''
| 1878
| [[Morrison Formation]] ([[Late Jurassic]], [[Oxfordian (stage)|Oxfordian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| Several referred specimens have been reassigned to other taxa
| [[File:Laosaurus celer pubis.png|200px]]
|-
| ''[[Latirhinus]]''
| 2012
| [[Cerro del Pueblo Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Mexico}}<br />({{flag|Coahuila}})
| As described, it represented a chimera composed of lambeosaurine and saurolophine remains.<ref>{{Cite journal|author1=Ángel Alejandro Ramírez-Velascoa |author2=Jesús Alvarado-Ortega|author3=Espinosa-Arrubarrena |year=2021 |title=Review of the taxonomic affinities of Latirhinus uitstlani, an emblematic Mexican hadrosaurid|journal=Journal of South American Earth Sciences|volume=110|page=103391|doi=10.1016/j.jsames.2021.103391|bibcode=2021JSAES.11003391R|url=https://www.sciencedirect.com/science/article/abs/pii/S0895981121002388#}}</ref> The exact holotypic bones belonged to a lambeosaurine<ref>{{cite journal | url=https://www.sciencedirect.com/science/article/pii/S0895981121005344 | title=Taphonomic attributes of the holotype of the lambeosaurine dinosaur Latirhinus uitstlani from the late Campanian of Mexico: Implications for its phylogenetic systematics | last1=Serrano-Brañas | first1=Claudia Inés | last2=Prieto-Márquez | first2=Albert | journal=Journal of South American Earth Sciences | year=2022 | volume=114 | page=103689 | doi=10.1016/j.jsames.2021.103689| bibcode=2022JSAES.11403689S }}</ref>
| [[File:Life reconstruction of Latirhinus uitstlani.png|200px]]
|-
| ''[[Lepidus praecisio|Lepidus]]''
| 2015
| [[Colorado City Formation]] ([[Late Triassic]], [[Norian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Muscle scars are preserved on the holotype bones
| [[File:Lepidus praecisio.jpg|200px]]
|-
| ''[[Leptoceratops]]''
| 1914
| [[Hell Creek Formation]], [[Lance Formation]], [[Scollard Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}}<br />{{flag|Wyoming}})
| Analysis of its teeth shows it could chew like a mammal, an adaptation to eating tough, fibrous plants<ref>{{cite journal |last1=Varriale |first1=Frank |title=Dental microwear reveals mammal-like chewing in the neoceratopsian dinosaur ''Leptoceratops gracilis'' |journal=PeerJ |date=2016 |volume=4 |pages=e2132 |doi=10.7717/peerj.2132 |pmid=27441111 |pmc=4941762 |doi-access=free }}</ref>
| [[File:Leptoceratops BW.jpg|200px]]
|-
| ''[[Leptorhynchos gaddisi|Leptorhynchos]]''
| 2013
| [[Aguja Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Had a slightly upturned mandible similar to those of oviraptorids
| [[File:Leptorhynchos by Nick Longrich.jpg|200px]]
|-
| ''[[Lokiceratops]]''
| 2024
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Unusually for a ceratopsid, its frill ornamentations were bilaterally asymmetrical. Closely related to ''[[Albertaceratops]]'' and ''[[Medusaceratops]]''<ref name="Lokiceratops">{{Cite journal |last1=Loewen |first1=Mark A. |last2=Sertich |first2=Joseph J. W. |last3=Sampson |first3=Scott |author-link3=Scott D. Sampson |last4=O’Connor |first4=Jingmai K. |author-link4=Jingmai O'Connor |last5=Carpenter |first5=Savhannah |last6=Sisson |first6=Brock |last7=Øhlenschlæger |first7=Anna |last8=Farke |first8=Andrew A. |last9=Makovicky |first9=Peter J. |last10=Longrich |first10=Nick |last11=Evans |first11=David C. |author-link11=David C. Evans (paleontologist) |date=20 June 2024 |title=''Lokiceratops rangiformis'' gen. et sp. nov. (Ceratopsidae: Centrosaurinae) from the Campanian Judith River Formation of Montana reveals rapid regional radiations and extreme endemism within centrosaurine dinosaurs |journal=[[PeerJ]] |language=en |volume=12 |pages=e17224 |doi=10.7717/peerj.17224 |issn=2167-8359 |doi-access=free|pmid=38912046 |pmc=11193970 }}</ref>
| [[File:Lokiceratops rangiformis.png|200px]]
|-
| ''[[Lophorhothon]]''
| 1960
| [[Mooreville Chalk]], [[Tar Heel/Coachman Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br /> ({{flag|Alabama}}<br /> {{flag|North Carolina}}?)
| Although incomplete, the holotype skull preserves evidence of a crest 
| [[File:Lophorhothon atopus.jpg|200px]]
|-
| ''[[Lythronax]]''
| 2013
| [[Wahweap Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Already had the forward-directed orbits of derived tyrannosaurids despite its early age
| [[File:Lythronax UDL.png|200px]]
|-
| ''[[Machairoceratops]]''
| 2016
| [[Wahweap Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Possessed two long, forward-pointing horns on the top of its frill
| [[File:Machairoceratops UDL.png|200px]]
|-
| ''[[Magnapaulia]]''
| 2012
| [[El Gallo Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Mexico}}<br />({{flag|Baja California}})
| Has been suggested to be semi-aquatic due to its tall, narrow tail<ref>{{cite journal |last=Morris |first=William J. |year=1981 |title=A new species of hadrosaurian dinosaur from the Upper Cretaceous of Baja California: ?''Lambeosaurus laticaudus'' |journal=Journal of Paleontology |volume=55 |issue=2 |pages=453–462 }}</ref>
| [[File:Magnapaulia laticaudus.jpg|200px]]
|-
| ''[[Maiasaura]]''
| 1979
| [[Oldman Formation]], [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| Remains of hundreds of individuals, including juveniles, eggs and nests, have been found at a single site<ref>Dodson, Peter & Britt, Brooks & Carpenter, Kenneth & Forster, Catherine A. & Gillette, David D. & Norell, Mark A. & Olshevsky, George & Parrish, J. Michael & Weishampel, David B. ''The Age of Dinosaurs''. Publications International, LTD. p.&nbsp;116-117. {{ISBN|0-7853-0443-6}}.</ref>
| [[File:Maiasaura BW.jpg|200px]]
|-
| ''[[Malefica]]''
| 2022
| [[Aguja Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Its discovery suggests a greater diversity of basal hadrosaurids than previously thought
| [[File:Malefica UDL.png|200px]]
|-
| ''[[Maraapunisaurus]]''
| 2018
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Colorado}})
| Named from a single, lost vertebra of immense size
| [[File:Maraapunisaurus.jpg|200px]]
|-
| ''[[Marshosaurus]]''
| 1976
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Colorado}}?<br />{{flag|Utah}})
| Potentially a close relative of ''[[Piatnitzkysaurus]]'' and ''[[Condorraptor]]''<ref>{{cite journal | last = Benson | first = Roger B. J. | author-link = Roger Benson | year = 2010 | title = A description of ''Megalosaurus bucklandii'' (Dinosauria: Theropoda) from the Bathonian of the UK and the relationships of Middle Jurassic theropods | journal = [[Zoological Journal of the Linnean Society]] | doi = 10.1111/j.1096-3642.2009.00569.x | volume = 158 | issue = 4 | pages = 882–935 | doi-access = free }}</ref>
| [[File:Marshosaurus restoration.jpg|200px]]
|-
| ''[[Martharaptor]]''
| 2012
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Had not yet acquired the robust feet of derived therizinosaurs
| [[File:Martharaptor.tif|200px]]
|-
| ''[[Medusaceratops]]''
| 2010
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Possessed elongated spikes curving away from the sides of its frill
| [[File:Medusaceratops NT.jpg|200px]]
|-
| ''[[Menefeeceratops]]''
| 2021
| [[Menefee Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| One of the oldest centrosaurines
| [[File:Menefeeceratops UDL.png|200px]]
|-
| ''[[Mercuriceratops]]''
| 2014
| [[Dinosaur Park Formation]], [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| Had "wing"-like projections on its [[squamosal]] bones
| [[File:Mercuriceratops NT small.jpg|200px]]
|-
| ''[[Microvenator]]''
| 1970
| [[Cloverly Formation]] ([[Early Cretaceous]], [[Albian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Teeth from ''[[Deinonychus]]'' have been mistakenly attributed to this genus
| [[File:Microvenator.jpg|200px]]
|-
| ''[[Mierasaurus]]''
| 2017
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| One of the latest-surviving turiasaurs<ref name=Mierasaurus>{{cite journal |last1=Royo-Torres |first1=R. |last2=Upchurch |first2=P. |last3=Kirkland |first3=J.I. |last4=DeBlieux |first4=D.D. |last5=Foster |first5=J.R. |last6=Cobos |first6=A. |last7=Alcalá |first7=L. |year=2017 |title=Descendants of the Jurassic turiasaurs from Iberia found refuge in the Early Cretaceous of western USA |journal=Scientific Reports |volume=7 |issue=1 |page=14311 |doi=10.1038/s41598-017-14677-2|pmid=29085006 |pmc=5662694 |bibcode=2017NatSR...714311R }}</ref>
| [[File:Mierasaurus Skull.png|200px]]
|-
| ''[[Moabosaurus]]''
| 2017
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Aptian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Described as a macronarian<ref>{{cite journal | last1 = Britt | first1 = B.B. | last2 = Scheetz | first2 = R.D. | last3 = Whiting | first3 = M.F. | last4 = Wilhite | first4 = D.R. | year = 2017 | title = ''Moabosaurus utahensis'', n. gen., n. sp., A New Sauropod From The Early Cretaceous (Aptian) of North America | journal = Contributions from the Museum of Paleontology, University of Michigan | volume = 32 | issue = 11 | pages = 189–243 | hdl = 2027.42/136227 | url = https://deepblue.lib.umich.edu/handle/2027.42/136227}}</ref> but has since been reinterpreted as a turiasaur closely related to ''[[Mierasaurus]]''<ref name=Mierasaurus />
| [[File:Moabosaurus utahensis restoration.png|200px]]
|-
| ''[[Monoclonius]]''
| 1876
| [[Dinosaur Park Formation]], [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| Only known from indistinct remains of juveniles and subadults
| [[File:Monoclonius 07539.JPG|200px]]
|-
| ''[[Montanoceratops]]''
| 1951
| [[Horseshoe Canyon Formation]]?, [[St. Mary River Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| Often restored with a short nasal horn although this may be a misplaced cheek horn<ref>Holtz, Thomas R. Jr. (2008) ''Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages'' [http://www.geol.umd.edu/~tholtz/dinoappendix/DinoappendixSummer2008.pdf Supplementary Information]</ref>
| [[File:Montanoceratops BW.jpg|200px]]
|-
| ''[[Moros intrepidus|Moros]]''
| 2019
| [[Cedar Mountain Formation]] ([[Late Cretaceous]], [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| The proportions of its metatarsals are similar to those of ornithomimids
| [[File:Moros intrepidus reconstruction.png|200px]]
|-
| ''[[Mymoorapelta]]''
| 1994
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Utah}})
| The first ankylosaur described from the Morrison Formation
| [[File:Mymoorapelta maysi.png|200px]]
|-
| ''[[Naashoibitosaurus]]''
| 1993
| [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Like other kritosaurins, it possessed a nasal arch, but it was not as tall as that of ''[[Gryposaurus]]''
| [[File:Naashoibitosaurus ostromi.png|200px]]
|-
| ''[[Nanosaurus]]''
| 1877
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Wyoming}})
| Several referred specimens were originally assigned to other genera
| [[File:Nanosaurus.jpg|200px]]
|-
| ''[[Nanuqsaurus]]''
| 2014
| [[Prince Creek Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|Alaska}})
| Described as a dwarf tyrannosaurid although undescribed remains suggest a size comparable to ''[[Albertosaurus]]''<ref>{{Cite journal|last1=Druckenmiller|first1=Patrick S.|last2=Erickson|first2=Gregory M.|last3=Brinkman|first3=Donald|last4=Brown|first4=Caleb M.|last5=Eberle|first5=Jaelyn J.|date=2021-08-23|title=Nesting at extreme polar latitudes by non-avian dinosaurs|journal=Current Biology|language=en|volume=31|issue=16|pages=3469–3478.e5|doi=10.1016/j.cub.2021.05.041|pmid=34171301|s2cid=235631483|issn=0960-9822|doi-access=free}}</ref>
| [[File:Nanuqsaurus hoglundi size chart.png|200px]]
|-
| ''[[Nasutoceratops]]''
| 2013
| [[Kaiparowits Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Possessed an enlarged nasal cavity and two long, curving horns similar to those of modern cattle
| [[File:Nasutoceratops UDL.png|200px]]
|-
| ''[[Navajoceratops]]''
| 2020
| [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Had a distinctive notch at the very top of its frill, similar to its potential ancestor ''[[Pentaceratops]]''<ref name=Navajoceratops>{{cite journal |last1=Fowler |first1=D.W. |last2=Freedman Fowler |first2=E.A. |title=Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico |journal=PeerJ |date=2020 |volume=8 |page=e9251 |doi=10.7717/peerj.9251|pmid=32547873 |pmc=7278894 |doi-access=free }}</ref>
| [[File:Navajoceratops.png|200px]]
|-
| ''[[Nedcolbertia]]''
| 1998
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Known from three partial skeletons. The specific name, ''justinhofmanni'', honors a six-year-old schoolboy who won a contest to have a dinosaur named after him
| [[File:Nedclobertia.jpg|200px]]
|- 
| ''[[Nevadadromeus]]''
| 2022
| [[Willow Tank Formation]] ([[Late Cretaceous]], [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Nevada}})
| The first non-avian dinosaur described from Nevada
| [[File:Nevadadromeus reconstruction.jpg|200px]]
|-
| ''[[Niobrarasaurus]]''
| 1995
| [[Niobrara Formation]] ([[Late Cretaceous]], [[Coniacian]] to [[Campanian]])
| {{flag|United States}}<br />({{flag|Kansas}})
| Originally mistakenly believed to have been aquatic<ref>Mehl, M. G. 1936. Hierosaurus coleii: a new aquatic dinosaur from the Niobrara Cretaceous of Kansas. Denison University Bulletin, Journal of the Scientific Laboratory 31: 1-20, 3 pls.</ref>
| [[File:Niobrarasaurus femur.jpg|200px]]
|-
| ''[[Nodocephalosaurus]]''
| 1999
| [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Closely related to Asian ankylosaurids<ref>{{Cite journal|first1=J.P. |last1=Wiersma |first2=R.B. |last2=Irmis |year=2018 |title=A new southern Laramidian ankylosaurid, ''Akainacephalus johnsoni'' gen. et sp. nov., from the upper Campanian Kaiparowits Formation of southern Utah, USA |journal=PeerJ |volume=6 |pages=e5016 |doi=10.7717/peerj.5016 |pmc=6063217 |pmid=30065856 |doi-access=free }}</ref>
|
|-
| ''[[Nodosaurus]]''
| 1889
| [[Frontier Formation]] ([[Late Cretaceous]], [[Cenomanian]] to [[Coniacian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| Its armor included banded dermal plates interspersed by bony nodules
| [[File:Nodosaurus 500 TWA.JPG|200px]]
|-
| ''[[Nothronychus]]''
| 2001
| [[Moreno Hill Formation]], [[Tropic Shale]] ([[Late Cretaceous]], [[Turonian]])
| {{flag|United States}}<br />({{flag|New Mexico}}<br />{{flag|Utah}})
| Would have lived in the marshes and swamps<ref name=Nothronychus1>{{cite book|last1=Paul|first1=G. S.|title=The Princeton Field Guide to Dinosaurs|publisher=Princeton University Press|year=2016|isbn=978-0-691-16766-4|edition=2nd|location=Princeton, New Jersey}}</ref> along the Turonian shoreline<ref>{{cite journal|last1=Hedrick|first1=B. P.|last2=Zanno|first2=L. E.|last3=Wolfe|first3=D. G.|last4=Dodson|first4=P.|date=2015|title=The Slothful Claw: Osteology and Taphonomy of Nothronychus mckinleyi and N. graffami (Dinosauria: Theropoda) and Anatomical Considerations for Derived Therizinosaurids|journal=PLOS ONE|volume=10|issue=6|pages=e0129449|bibcode=2015PLoSO..1029449H|doi=10.1371/journal.pone.0129449|doi-access=free|pmc=4465624|pmid=26061728}}</ref>
| [[File:Nothronychus mckinleyi Restoration.png|200px]]
|-
| ''[[Ojoraptorsaurus]]''
| 2011
| [[Ojo Alamo Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Only known from an incomplete pair of [[Pubis (bone)|pubes]]
| [[File:Ojoraptorsaurus boerei profile reconstruction.jpg|200px]]
|-
| ''[[Oohkotokia]]''
| 2013
| [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Potentially a synonym of ''[[Scolosaurus]]''<ref>{{Cite journal | last1 = Arbour | first1 = V. M. | last2 = Currie | first2 = P. J. | doi = 10.1371/journal.pone.0062421 | editor1-last = Farke | editor1-first = Andrew A | title = Euoplocephalus tutus and the Diversity of Ankylosaurid Dinosaurs in the Late Cretaceous of Alberta, Canada, and Montana, USA | journal = PLOS ONE | volume = 8 | issue = 5 | pages = e62421 | year = 2013 | pmid =  23690940| pmc = 3648582 | bibcode = 2013PLoSO...862421A| doi-access = free }}</ref>
| [[File:Oohkotokia.jpg|200px]]
|-
| ''[[Ornatops]]''
| 2021
| [[Menefee Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Preserves a pair of bumps on its skull which may have anchored a crest
| [[File:Ornatops incantatus.png|200px]]
|-
| ''[[Ornitholestes]]''
| 1903
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| May have possessed a sickle claw similar to those of dromaeosaurids<ref>{{cite journal|last=Ostrom|first=John H.|author-link=John Ostrom|year=1969|title=Osteology of ''Deinonychus antirrhopus'', an unusual theropod from the Lower Cretaceous of Montana|journal=Peabody Museum of Natural History Bulletin|volume=30|pages=1–165}}</ref>
| [[File:Ornitholestes reconstruction.png|200px]]
|-
| ''[[Ornithomimus]]''
| 1890
| [[Denver Formation]], [[Dinosaur Park Formation]], [[Ferris Formation]]?, [[Horseshoe Canyon Formation]], [[Kaiparowits Formation]]? ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Utah}}?<br />{{flag|Wyoming}})
| One referred specimen preserves impressions of ostrich-like feathers covering most of its body<ref>{{cite journal|doi=10.1016/j.cretres.2015.10.004|title=A densely feathered ornithomimid (Dinosauria: Theropoda) from the Upper Cretaceous Dinosaur Park Formation, Alberta, Canada|journal=Cretaceous Research|volume=58|pages=108–117|year=2016|last1=Van Der Reest|first1=Aaron J.|last2=Wolfe|first2=Alexander P.|last3=Currie|first3=Philip J.|bibcode=2016CrRes..58..108V }}</ref>
| [[File:"Ornithomimus" sp. by Tom Parker.png|200px]]
|-
| ''[[Orodromeus]]''
| 1988
| [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Eggs considered to belong to this taxon may have actually come from a troodontid<ref>{{cite journal | last1 = Varricchio | first1 = D.J. | last2 = Jackson | first2 = F. | last3 = Borkowski | first3 = J.J. | last4 = Horner | first4 = J.R. | title = Nest and egg clutches of the dinosaur ''Troodon formosus'' and the evolution of avian reproductive traits | journal = Nature | volume = 385 | issue = 6613 | pages = 247–250 | year = 1997 | doi = 10.1038/385247a0 | bibcode = 1997Natur.385..247V | s2cid = 4313286 }}</ref>
| [[File:Orodromeus (pencil 2013).png|200px]]
|-
| ''[[Oryctodromeus]]''
| 2007
| [[Blackleaf Formation]], [[Wayan Formation]] ([[Late Cretaceous]], [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Idaho}}<br />{{flag|Montana}})
| Several specimens have been preserved in burrows
| [[File:Oryctodromeus.jpg|200px]]
|-
| ''[[Osmakasaurus]]''
| 2011
| [[Lakota Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|South Dakota}})
| Originally named as a species of ''[[Camptosaurus]]''
|
|-
| ''[[Pachycephalosaurus]]''
| 1943
| [[Hell Creek Formation]], [[Lance Formation]], [[Scollard Formation]]? ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}}?)<br />{{flag|United States}}<br />({{flag|Montana}}<br />{{flag|South Dakota}}<br />{{flag|Wyoming}})
| Possessed a tall, rounded head dome surrounded by bony knobs
| [[File:Pachycephalosaurus Reconstruction.jpg|200px]]
|-
| ''[[Pachyrhinosaurus]]''
| 1950
| [[Horseshoe Canyon Formation]], [[Prince Creek Formation]], [[St. Mary River Formation]], [[Wapiti Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Alaska}})
| Three species have been named, each with a unique pattern of cranial ornamentation
| [[File:Pachyrhinosaurus BW.jpg|200px]]
|-
| ''[[Palaeoscincus]]''
| 1856
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Although many restorations depict it with the spikes of ''[[Edmontonia]]'' and the tail club of ''[[Ankylosaurus]]'', this is most likely incorrect
| [[File:Palaeoscincus costatus.jpg|200px]]
|-
| ''[[Panoplosaurus]]''
| 1919
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Unlike other nodosaurids, it lacked enlarged spikes
| [[File:Panoplosaurus 055.JPG|200px]]
|-
| ''[[Parasaurolophus]]''
| 1922
| [[Dinosaur Park Formation]], [[Fruitland Formation]], [[Kaiparowits Formation]], [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|New Mexico}}<br />{{flag|Utah}})
| Possessed a curved, hollow crest that varied in size between species
| [[File:Parasaurolophus walkeri.png|200px]]
|-
| ''[[Paraxenisaurus]]''
| 2020
| [[Cerro del Pueblo Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Mexico}}<br />({{flag|Coahuila}})
| Described as the first deinocheirid from North America
| [[File:Paraxenisaurus normalensis as Deinocheirid.jpg|200px]]
|-
| ''[[Parksosaurus]]''
| 1937
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Had long toes which may be an adaptation to walking on soft soils in watercourses and marshlands<ref name=Nothronychus1 />
| [[File:Parksosaurus Steveoc86.jpg|200px]]
|-
| ''[[Paronychodon]]''
| 1876
| [[Hell Creek Formation]], [[Judith River Formation]], [[Lance Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|Montana}}<br />{{flag|North Dakota}}<br />{{flag|South Dakota}}<br />{{flag|Wyoming}})
| Only known from highly distinctive teeth
| [[File:Paronychodon.png|200px]]
|-
| ''[[Pawpawsaurus]]''
| 1996
| [[Paw Paw Formation]] ([[Early Cretaceous]], [[Albian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Had enlarged nasal cavities that gave it an acute sense of smell, even more powerful than that of contemporary theropods<ref>{{cite journal|last1=Paulina-Carabajal|first1=A.|last2=Lee|first2=Y.N.|last3=Jacobs|first3=L.L.|year=2016|title=Endocranial Morphology of the Primitive Nodosaurid Dinosaur ''Pawpawsaurus campbelli'' from the Early Cretaceous of North America|journal=PLOS ONE|volume=11|issue=3|pages=e0150845|doi=10.1371/journal.pone.0150845|pmid=27007950|pmc=4805287|bibcode=2016PLoSO..1150845P|doi-access=free}}</ref>
| [[File:Pawpawsaurus campbelli.jpg|200px]]
|-
| ''[[Pectinodon]]''
| 1982
| [[Hell Creek Formation]], [[Lance Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| Had comb-like serrations on its teeth
| [[File:Pectinodon UDL.png|200px]]
|-
| ''[[Peloroplites]]''
| 2008
| [[Cedar Mountain Formation]] ([[Late Cretaceous]], [[Cenomanian]] to [[Turonian]])
| {{flag|United States}}<br />({{flag|Utah}})
| One of the largest known nodosaurids
| [[File:Peloroplites price 1.jpg|200px]]
|-
| ''[[Pentaceratops]]''
| 1923
| [[Fruitland Formation]], [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Its epijugal bones, the hornlets under its eyes, were relatively large
| [[File:Pentaceratops BW.jpg|200px]]
|-
| ''[[Planicoxa]]''
| 2001
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Barremian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Utah}})
| The rear of its ilium was characteristically flat
| [[File:Planicoxa reconstruction raingerr.png|200px]]
|-
| ''[[Platypelta]]''
| 2018
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Originally assigned to ''[[Euoplocephalus]]'' but was given its own genus because of several morphological differences
| [[File:Platypelta AMNH 5337.tiff|200px]]
|-
| ''[[Platytholus]]''
| 2023
| [[Hell Creek Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Differs from juveniles of the contemporary ''[[Pachycephalosaurus]]'' and ''[[Sphaerotholus]]'', hence its classification as a new genus
| [[File:Platytholus clemensi.png|200px]]
|-
| ''[[Podokesaurus]]''
| 1911
| [[Portland Formation]] ([[Early Jurassic]], [[Hettangian]] to [[Sinemurian]])
| {{flag|United States}}<br />({{flag|Massachusetts}})
| May have had a tail one and a half times longer than the rest of its skeleton<ref>{{cite journal |last1=von Huene |first1=F. |title=Beiträge zur Geschichte der Archosaurier |journal=Geologische und Paläontologische Abhandlungen |date=1914 |volume=13 |pages=1–53 |url=https://www.biodiversitylibrary.org/item/42622#page/45/mode/1up |language=de |access-date=October 7, 2020 |archive-date=October 9, 2020 |archive-url=https://web.archive.org/web/20201009120205/https://www.biodiversitylibrary.org/item/42622#page/45/mode/1up |url-status=live }}</ref>
| [[File:Podokesaurus restoration.jpg|200px]]
|-
| ''[[Polyodontosaurus]]''
| 1932
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| May be identical to ''[[Latenivenatrix]]''<ref name=Polyodontosaurus>{{cite journal|last1=van der Reest|first1=A.J.|last2=Currie|first2=P.J.|year=2017|title=Troodontids (Theropoda) from the Dinosaur Park Formation, Alberta, with a description of a unique new taxon: implications for deinonychosaur diversity in North America|journal=Canadian Journal of Earth Sciences|volume=54|issue=9|pages=919–935|doi=10.1139/cjes-2017-0031|bibcode=2017CaJES..54..919V|hdl=1807/78296|hdl-access=free}}</ref>
|
|-
| ''[[Polyonax]]''
| 1874
| [[Denver Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|Colorado}})
| Poorly known
|
|-
| ''[[Prenoceratops]]''
| 2004
| [[Oldman Formation]], [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| The only basal neoceratopsian known from a bonebed
| [[File:Prenoceratops BW.jpg|200px]]
|-
| ''[[Priconodon]]''
| 1888
| [[Arundel Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Maryland}})
| Large but only known from teeth
| [[File:Priconodon.jpg|200px]]
|-
| ''[[Probrachylophosaurus]]''
| 2015
| [[Foremost Formation]], [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| Shows a skull morphology transitional between crestless and crested brachylophosaurins
| [[File:Probrachylophosaurus bergei.png|200px]]
|-
| ''[[Propanoplosaurus]]''
| 2011
| [[Patuxent Formation]] ([[Early Cretaceous]], [[Aptian]])
| {{flag|United States}}<br />({{flag|Maryland}})
| Only known from the imprints of a neonate skeleton
| [[File:Propanoplosaurus restoration.png|200px]]
|-
| ''[[Prosaurolophus]]''
| 1916
| [[Dinosaur Park Formation]], [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}})
| Had a relatively large head for a hadrosaur
| [[File:Prosaurolophus Maximus.jpg|200px]]
|-
| ''[[Protohadros]]''
| 1998
| [[Woodbine Formation]] ([[Late Cretaceous]], [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Possessed a downturned jaw which may be an adaptation to grazing on low-growing plants
|
|-
| ''[[Pteropelyx]]''
| 1889
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Potentially synonymous with ''[[Corythosaurus]]'', although this cannot be confirmed due to the lack of cranial remains<ref>Brett-Surman, M.K., 1989. A revision of the Hadrosauridae (Reptilia: Ornithischia) and their evolution during the Campanian and Maastrichtian. Ph.D. dissertation, George Washington University, Washington, D.C.. pp.&nbsp;1–272.</ref>
|
|-
| ''[[Rativates]]''
| 2016
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Originally described as a specimen of ''[[Struthiomimus]]''
| [[File:Rativates.png|200px]]
|-
| ''[[Regaliceratops]]''
| 2015
| [[St. Mary River Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Possessed a series of large, pentagonal plates lining its frill
| [[File:Regaliceratops peterhewsi.jpg|200px]]
|-
| ''[[Richardoestesia]]''
| 1990
| [[Aguja Formation]], [[Dinosaur Park Formation]], [[Ferris Formation]]?, [[Hell Creek Formation]]?, [[Horseshoe Canyon Formation]]?, [[Lance Formation]]?, [[Scollard Formation]]? ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]]?)
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}}?<br />{{flag|Texas}}<br />{{flag|Wyoming}}?)
| Teeth assigned to this genus have been recovered all around the world, in deposits spanning from the Jurassic to the Cretaceous, although they may not represent a single taxon
| [[File:Ojo Alamo cf. Richardoestesia sp profile reconstruction.jpg|200px]]
|-
| ''[[Rugocaudia]]''
| 2012
| [[Cloverly Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Some of this genus' remains include several caudal vertebrae
| [[File:Rugocaudia.png|200px]]
|-
| ''[[Sarahsaurus]]''
| 2011
| [[Kayenta Formation]] ([[Early Jurassic]], [[Sinemurian]] to [[Pliensbachian]])
| {{flag|United States}}<br />({{flag|Arizona}})
| Possessed strong hands which may indicate a feeding specialization
| [[File:Sarahsaurus restoration.PNG|200px]]
|-
| ''[[Saurolophus]]''
| 1912
| [[Horseshoe Canyon Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Had a short, solid crest that pointed directly upwards. A larger, more well-known species has been found in Mongolia
| [[File:Saurolophus scalation.png|200px]]
|-
| ''[[Sauropelta]]''
| 1970
| [[Cedar Mountain Formation]]?, [[Cloverly Formation]] ([[Early Cretaceous]], [[Albian]])
| {{flag|United States}}<br />({{flag|Montana}}<br />{{flag|Utah}}?<br />{{flag|Wyoming}})
| Its tail had at least forty vertebrae, making up half of its total body length
| [[File:Sauropelta jconway.png|200px]]
|-
| ''[[Saurophaganax]]''
| 1995
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|New Mexico}}?<br />{{flag|Oklahoma}})
| Originally described as a large theropod, but was later suggested to be a chimera of sauropod and theropod bones. The holotype bone may have belonged to a sauropod<ref name="DanisonEtAl2024">{{Cite journal |last1=Danison |first1=Andrew |last2=Wedel |first2=Mathew |last3=Barta |first3=Daniel |last4=Woodward |first4=Holly |last5=Flora |first5=Holley |last6=Lee |first6=Andrew |last7=Snively |first7=Eric |date=2024-12-21 |title=Chimerism in specimens referred to ''Saurophaganax maximus'' reveals a new species of ''Allosaurus'' (Dinosauria, Theropoda) |url=https://journals.library.ualberta.ca/vamp/index.php/VAMP/article/view/29404 |journal=Vertebrate Anatomy Morphology Palaeontology |language=en |volume=12 |doi=10.18435/vamp29404 |issn=2292-1389|doi-access=free }}</ref>
| [[File:Saurophaganax maximus (holotype, OMNH 112).png|200px]]
|-
| ''[[Sauroposeidon]]''
| 2000
| [[Antlers Formation]], [[Cloverly Formation]], [[Glen Rose Formation]], [[Twin Mountains Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Oklahoma}}<br />{{flag|Texas}}<br />{{flag|Wyoming}})
| Could raise its head up to {{convert|18|m|ft}} in the air, the height of a six-story building<ref>{{cite journal|last=Wedel|first=Mathew J.|author2=Cifelli, R. L.|author3=Sanders, R.. K.|s2cid=59141243|year=2000|title=Osteology, paleobiology, and relationships of the sauropod dinosaur ''Sauroposeidon''|url=https://pdfs.semanticscholar.org/9efe/8db6eb32247f90a760110d5a9695977fb761.pdf|archive-url=https://web.archive.org/web/20200626075134/https://pdfs.semanticscholar.org/9efe/8db6eb32247f90a760110d5a9695977fb761.pdf|archive-date=2020-06-26|journal=Acta Palaeontologica Polonica|volume=45|pages=343&ndash;388}}</ref>
| [[File:Sauroposeidon proteles.jpg|200px]]
|-
| ''[[Saurornitholestes]]''
| 1978
| [[Dinosaur Park Formation]], [[Donoho Creek Formation]], [[Kirtland Formation]], [[Mooreville Chalk]], [[Oldman Formation]], [[Tar Heel/Coachman Formation]], [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Alabama}}<br />{{flag|Montana}}<br />{{flag|New Mexico}}<br />{{flag|South Carolina}})
| Its second premaxillary teeth could be adapted to preening feathers<ref name=Saurornitholestes>{{cite journal |last1=Currie |first1=Philip J. |last2=Evans |first2=David C. |title=Cranial Anatomy of New Specimens of ''Saurornitholestes langstoni'' (Dinosauria, Theropoda, Dromaeosauridae) from the Dinosaur Park Formation (Campanian) of Alberta |journal=The Anatomical Record |volume=303 |issue=4 |pages=691–715 |doi=10.1002/ar.24241|pmid=31497925 |year=2020 |s2cid=202002676 |doi-access=free }}</ref>
| [[File:Saurornitholestes digging Burrows wahweap.jpg|200px]]
|-
| ''[[Scolosaurus]]''
| 1928
| [[Dinosaur Park Formation]], [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Once widely believed to be synonymous with other Campanian ankylosaurids
| [[File:Scolosaurus SW.png|200px]]
|-
| ''[[Scutellosaurus]]''
| 1981
| [[Kayenta Formation]] ([[Early Jurassic]], [[Sinemurian]])
| {{flag|United States}}<br />({{flag|Arizona}})
| Had hundreds of osteoderms arranged in rows along its back and tail
| [[File:Scutellosaurus.jpg|200px]]
|-
| ''[[Segisaurus]]''
| 1936
| [[Navajo Sandstone]] ([[Early Jurassic]], [[Pliensbachian]] to [[Toarcian]])
| {{flag|United States}}<br />({{flag|Arizona}})
| Preserves evidence of a [[furcula|wishbone]] similar to that of modern birds
| [[File:Segisaurus.jpg|200px]]
|-
| ''[[Seitaad]]''
| 2010
| [[Navajo Sandstone]] ([[Early Jurassic]], [[Pliensbachian]])
| {{flag|United States}}<br />({{flag|Utah}})
| The holotype may have died when a sand dune collapsed on it<ref>{{Cite journal|author=Joseph J. W. Sertich|author2=Mark A. Loewen|name-list-style=amp |year=2010 |title=A New Basal Sauropodomorph Dinosaur from the Lower Jurassic Navajo Sandstone of Southern Utah |journal=PLOS ONE |volume=5 |issue=3 |pages=e9789 |doi=10.1371/journal.pone.0009789 |pmid= 20352090|pmc=2844413|bibcode=2010PLoSO...5.9789S|editor1-last=Laudet|editor1-first=Vincent |doi-access=free}}</ref>
| [[File:Seitaad NT.jpg|200px]]
|-
| ''[[Siats]]''
| 2013
| [[Cedar Mountain Formation]] ([[Late Cretaceous]], [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Large but inconsistent in phylogenetic placement
| [[File:Siats reconstruction.png|200px]]
|-
| ''[[Sierraceratops]]''
| 2022
| [[Hall Lake Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| May be part of a unique clade of ceratopsians only known from southern Laramidia<ref>{{Cite journal|last1=Dalman|first1=Sebastian G.|last2=Lucas|first2=Spencer G.|last3=Jasinski|first3=Steven E.|last4=Longrich|first4=Nicholas R.|date=2021-09-29|title=Sierraceratops turneri, a new chasmosaurine ceratopsid from the Hall Lake Formation (Upper Cretaceous) of south-central New Mexico|url=https://www.sciencedirect.com/science/article/pii/S0195667121002822|journal=Cretaceous Research|volume=130|language=en|page=105034|doi=10.1016/j.cretres.2021.105034|s2cid=244210664|issn=0195-6671}}</ref>
| [[File:Sierraceratops.jpg|200px]]
|-
| ''[[Silvisaurus]]''
| 1960
| [[Dakota Formation]] ([[Early Cretaceous]] to [[Late Cretaceous]], [[Albian]] to [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Kansas}})
| Hypothesized to live in a forested habitat
| [[File:Silvisaurus.jpg|200px]]
|-
| ''[[Smitanosaurus]]''
| 2020
| [[Morrison Formation]] ([[Late Jurassic]], [[Oxfordian (stage)|Oxfordian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}})
| Only known from a partial skull and some vertebrae
| [[File:Smitanosaurus agilis skull and neck.jpg|200px]]
|-
| ''[[Sonorasaurus]]''
| 1998
| [[Turney Ranch Formation]] ([[Early Cretaceous]] to [[Late Cretaceous]], [[Albian]] to [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Arizona}})
| State dinosaur of Arizona
| [[File:Sonorasaurus thompsoni.jpg|200px]]
|-
| ''[[Sphaerotholus]]''
| 2002
| [[Dinosaur Park Formation]], [[Frenchman Formation]], [[Hell Creek Formation]], [[Horseshoe Canyon Formation]], [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}}<br />{{flag|Saskatchewan}})<br />{{flag|United States}}<br />({{flag|Montana}}<br />{{flag|New Mexico}})
| Five species have been named, all known from skull elements. Lived in a broad range
| [[File:Sphaerotholus.jpg|200px]]
|-
| ''[[Spiclypeus]]''
| 2016
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Has been described as "boldly audacious"<ref>{{cite journal |author=Jordan C. Mallon |author2=Christopher J. Ott |author3=Peter L. Larson |author4=Edward M. Iuliano |author5=David C. Evans |year=2016 |title=''Spiclypeus shipporum'' gen. et sp. nov., a Boldly Audacious New Chasmosaurine Ceratopsid (Dinosauria: Ornithischia) from the Judith River Formation (Upper Cretaceous: Campanian) of Montana, USA |journal=PLOS ONE |volume=11 |issue=5 |pages=e0154218 |doi=10.1371/journal.pone.0154218 |pmid=27191389 |pmc=4871577|bibcode=2016PLoSO..1154218M |doi-access=free }}</ref>
| [[File:Spiclypeus NT small.jpg|200px]]
|-
| ''[[Spinops]]''
| 2011
| [[Dinosaur Park Formation]]?/[[Oldman Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Described almost a century after its remains were collected
| [[File:Spinops NT.jpg|200px]]
|-
| ''[[Stegoceras]]''
| 1902
| [[Dinosaur Park Formation]], [[Fruitland Formation]]?, [[Kirtland Formation]]?, [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|New Mexico}}?)
| May have been an indiscriminate bulk-feeder due to the shape of its snout<ref>{{cite journal |last1=Hudgins |first1=Michael Naylor |last2=Currie |first2=Philip J. |last3=Sullivan |first3=Corwin |title=Dental assessment of ''Stegoceras validum'' (Ornithischia: Pachycephalosauridae) and ''Thescelosaurus neglectus'' (Ornithischia: Thescelosauridae): paleoecological inferences |journal=Cretaceous Research |date=16 October 2021 |volume=130 |page=105058 |doi=10.1016/j.cretres.2021.105058 |s2cid=239253658 }}</ref>
| [[File:Stegoceras validum.jpg|200px]]
|-
| ''[[Stegopelta]]''
| 1905
| [[Frontier Formation]] ([[Early Cretaceous]] to [[Late Cretaceous]], [[Albian]] to [[Cenomanian]])
| {{flag|United States}}<br />({{flag|Wyoming}})
| May have possessed a sacral shield similar to other nodosaurids
| [[File:Stegopelta pelvic armor.jpg|200px]]
|-
| ''[[Stegosaurus]]''
| 1877
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Wyoming}})
| Had a single alternating row of large, kite-shaped plates
| [[File:Stegosaurus stenops Life Reconstruction.png|200px]]
|-
| ''[[Stellasaurus]]''
| 2020
| [[Two Medicine Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Possessed an enlarged, thickened nasal horn
| [[File:Nasal horncore of Stellasaurus.jpg|200px]]
|-
| ''[[Stenonychosaurus]]''
| 1932
| [[Dinosaur Park Formation]], [[Two Medicine Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}}?)
| Its brain-to-body mass ratio is one of the highest of any non-avian dinosaur
| [[File:Life reconstruction of Stenonychosaurus.png|200px]]
|-
| ''[[Stephanosaurus]]''
| 1914
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Poorly known
| [[File:Trachodon (Pteropelyx) marginatus humerus and skin.png|200px]]
|-
| ''[[Stokesosaurus]]''
| 1974
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]]? to [[Tithonian]])
| {{flag|United States}}<br />({{flag|South Dakota}}?<br />{{flag|Utah}})
| Only known from a few remains but they are enough to tell that it was a tyrannosauroid
| [[File:Stokesosaurus by Tom Parker.png|200px]]
|-
| ''[[Struthiomimus]]''
| 1917
| [[Horseshoe Canyon Formation]]?, [[Lance Formation]]?, [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]]?)
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Wyoming}}?)
| Known from many specimens, indicating it was a common animal
| [[File:Struthiomimus BW.jpg|200px]]
|-
| ''[[Styracosaurus]]''
| 1913
| [[Dinosaur Park Formation]], [[Two Medicine Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})<br />{{flag|United States}}<br />({{flag|Montana}}?)
| Possessed several long horns jutting out from the top of its frill, the patterns of which could have varied between individuals<ref>{{Cite journal |first1=R.B. |last1=Holmes |first2=W.S. |last2=Persons |first3=B. |last3=Singh Rupal |first4=A. |last4=Jawad Qureshi |first5=P.J. |last5=Currie |year=2020 |title=Morphological variation and asymmetrical development in the skull of ''Styracosaurus albertensis'' |journal=Cretaceous Research |doi=10.1016/j.cretres.2019.104308 |volume=107 |page=104308|bibcode=2020CrRes.10704308H |s2cid=210260909 }}</ref>
| [[File:Styracosaurus BW.jpg|200px]]
|-
| ''[[Supersaurus]]''
| 1985
| [[Morrison Formation]] ([[Late Jurassic]], [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Wyoming}})
| Several remains were originally believed to represent their own genera
| [[File:Supersaurus dinosaur.png|200px]]
|-
| ''[[Suskityrannus]]''
| 2019
| [[Moreno Hill Formation]] ([[Late Cretaceous]], [[Turonian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Small yet already possessed several features of larger, more derived tyrannosaurids, including an arctometatarsus
| [[File:Suskityrannus life reconstruction.png|200px]]
|-
| ''[[Suuwassea]]''
| 2004
| [[Morrison Formation]] ([[Late Jurassic]], [[Oxfordian (stage)|Oxfordian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Shares features with both diplodocids and dicraeosaurids, but is most likely a member of the latter group<ref name=Atlantosaurus2 /><ref name=Kaatedocus/>
| [[File:Suuwassea Skeletal.svg|200px]]
|-
| ''[[Talos sampsoni|Talos]]''
| 2011
| [[Kaiparowits Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| The holotype specimen preserves a pathology on its sickle claw<ref>{{Cite journal|author=Lindsay E. Zanno, David J. Varricchio, Patrick M. O'Connor, Alan L. Titus and Michael J. Knell |year=2011 |title=A new troodontid theropod, ''Talos sampsoni'' gen. et sp. nov., from the Upper Cretaceous Western Interior Basin of North America |journal=PLOS ONE |volume=6 |pages=e24487 |doi=10.1371/journal.pone.0024487 |pmid=21949721 |pmc=3176273 |issue=9|bibcode=2011PLoSO...624487Z |doi-access=free }}</ref>
| [[File:Talos sampsoni.jpg|200px]]
|-
| ''[[Tanycolagreus]]''
| 2005
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Utah}}<br />{{flag|Wyoming}})
| Had a long, blunt snout
| [[FIle:Tanycolagreus reconstruction.png|200px]]
|-
| ''[[Tatankacephalus]]''
| 2009
| [[Cloverly Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Retained premaxillary teeth in its upper jaws, a basal trait
| 
|-
| ''[[Tawa hallae|Tawa]]''
| 2009
| [[Chinle Formation]] ([[Late Triassic]], [[Norian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Well-preserved but inconsistent in phylogenetic placement
| [[File:Tawa hallae Martz.jpg|200px]]
|-
| ''[[Tenontosaurus]]''
| 1970
| [[Antlers Formation]], [[Arundel Formation]], [[Cedar Mountain Formation]], [[Cloverly Formation]], [[Paluxy Formation]], [[Twin Mountains Formation]], [[Wayan Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Idaho}}<br />{{flag|Maryland}}<br />{{flag|Montana}}<br />{{flag|Oklahoma}}<br />{{flag|Texas}}<br />{{flag|Utah}})
| Remains of this genus are often found associated with skeletons of ''[[Deinonychus]]''<ref>{{cite journal|doi=10.1080/02724634.1995.10011256|last1=Maxwell|first1=W. D. |last2=Ostrom |first2=J. H. |year=1995 |title=Taphonomy and paleobiological implications of ''Tenontosaurus''-''Deinonychus'' associations|journal=Journal of Vertebrate Paleontology |volume=15 |issue=4 |pages=707–712|bibcode=1995JVPal..15..707M }} ([http://www.vertpaleo.org/publications/jvp/15-707-712.cfm abstract] {{webarchive|url=https://web.archive.org/web/20070927204328/http://www.vertpaleo.org/publications/jvp/15-707-712.cfm |date=2007-09-27 }})</ref>
| [[File:Tenontosaurus BW.jpg|200px]]
|-
| ''[[Teratophoneus]]''
| 2011
| [[Kaiparowits Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Its snout was shorter and deeper than those of other tyrannosaurids
| [[File:Teratophoneus2 NT.jpg|200x200px]]
|-
| ''[[Terminocavus]]''
| 2020
| [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Had a teardrop-shaped hole on the top of its frill which was almost closed off by a pair of epoccipitals
| [[File:Terminocavus.jpg|200px]]
|-
| ''[[Texacephale]]''
| 2010
| [[Aguja Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Might represent a specimen of ''[[Stegoceras]]''<ref name=":0">{{Cite journal |last1=Wick |first1=Steven L. |last2=Lehman |first2=Thomas M. |date=2024-09-19 |title=A rare 'flat-headed' pachycephalosaur (Dinosauria: Pachycephalosauridae) from West Texas, USA, with morphometric and heterochronic considerations |journal=Geobios |volume=86 |pages=89–106 |doi=10.1016/j.geobios.2024.08.006 |issn=0016-6995}}</ref>
| [[File:Texacephale langstoni skull dome by Nick Longrich.png|200px]]
|-
| ''[[Texasetes]]''
| 1995
| [[Paw Paw Formation]] ([[Early Cretaceous]], [[Albian]])
| {{flag|United States}}<br />({{flag|Texas}})
| Potentially synonymous with ''[[Pawpawsaurus]]''
| [[File:NMNH-USNM337987 1.jpg|200px]]
|-
| ''[[Thanatotheristes]]''
| 2020
| [[Foremost Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| A close relative of ''[[Daspletosaurus]]''<ref>{{Cite journal |last1=Voris |first1=Jared T. |last2=Therrien |first2=Francois |last3=Zelenitzky |first3=Darla K. |last4=Brown |first4=Caleb M. |year=2020 |title=A new tyrannosaurine (Theropoda:Tyrannosauridae) from the Campanian Foremost Formation of Alberta, Canada, provides insight into the evolution and biogeography of tyrannosaurids |journal=[[Cretaceous Research]] |volume=110 |page=104388 |doi=10.1016/j.cretres.2020.104388|bibcode=2020CrRes.11004388V |s2cid=213838772 }}</ref>
| [[File:Thanatotheristes.jpg|200px]]
|-
| ''[[Theiophytalia]]''
| 2006
| [[Purgatoire Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Colorado}})
| Only known from a skull originally referred to ''[[Camptosaurus]]''
| [[File:Theiophytalia skull.jpg|200px]]
|-
| ''[[Thescelosaurus]]''
| 1913
| [[Frenchman Formation]], [[Hell Creek Formation]], [[Lance Formation]], [[Laramie Formation]], [[Scollard Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}}<br />{{flag|Saskatchewan}})<br />{{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Montana}}<br />{{flag|North Dakota}}<br />{{flag|South Dakota}}<br />{{flag|Wyoming}})
| One specimen was originally considered to have preserved its heart, although this was later found to be a mineral concretion<ref>{{cite journal |last=Cleland |first=Timothy P. |author2=Stoskopf, Michael K. |author3= Schweitzer, Mary H.  |title=Histological, chemical, and morphological reexamination of the "heart" of a small Late Cretaceous ''Thescelosaurus'' |journal=Naturwissenschaften |year=2011 |volume=98 |doi=10.1007/s00114-010-0760-1 |issue=3 |pages=203–211 |pmid=21279321|bibcode = 2011NW.....98..203C |s2cid=2408562 }}</ref>
| [[File:Thescelosaurus filamented.jpg|200px]]
|-
| ''[[Thespesius]]''
| 1856
| [[Lance Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|South Dakota}})
| Once suggested to be a possible Miocene mammal
| [[File:Thespesius occidentalis.jpg|200px]]
|-
| ''[[Tichosteus]]''
| 1877
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]])
| {{flag|United States}}<br />({{flag|Colorado}})
| Two species have been named, both from isolated vertebrae
| [[File:Tichosteus lucasanus.jpg|200px]]
|-
| ''[[Titanoceratops]]''
| 2011
| [[Fruitland Formation]]?/[[Kirtland Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Potentially a large, old specimen of ''[[Pentaceratops]]''<ref name=Navajoceratops />
| [[File:Titanoceratops ouranos life restoration.jpg|200px]]
|-
| ''[[Tlatolophus]]''
| 2021
| [[Cerro del Pueblo Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Mexico}}<br />({{flag|Coahuila}})
| Possessed a short, broad crest resembling an inverted comma
| [[File:Tlatolophus.png|200px]]
|-
| ''[[Torosaurus]]''
| 1891
| [[Frenchman Formation]], [[Hell Creek Formation]], [[Lance Formation]], [[Scollard Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}}<br />{{flag|Saskatchewan}})<br />{{flag|United States}}<br />({{flag|Colorado}}?<br />{{flag|Montana}}?<br />{{flag|New Mexico}}?<br />{{flag|North Dakota}}?<br />{{flag|South Dakota}}<br />{{flag|Texas}}?<br />{{flag|Utah}}?<br />{{flag|Wyoming}})
| Once believed to be potentially synonymous with ''[[Triceratops]]''
| [[File:Torosaurus life restoration.png|200px]]
|-
| ''[[Torvosaurus]]''
| 1979
| [[Morrison Formation]] ([[Late Jurassic]], [[Kimmeridgian]] to [[Tithonian]])
| {{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Wyoming}})
| Had short but powerfully built arms. Several species, many of them unnamed, have been found in Europe, South America and possibly Africa
| [[File:Torvosaurus tanneri Reconstruction.png|200px]]
|-
| ''[[Tototlmimus]]''
| 2016
| [[Packard Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Mexico}}<br />({{flag|Sonora}})
| The southernmost ornithomimid known from North America
|
|-
| ''[[Trachodon]]''
| 1856
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Several remains assigned to this genus actually belong to other taxa, most notably ''[[Edmontosaurus]]''
| [[File:Trachodon mirabilis.jpg|200px]]
|-
| ''[[Triceratops]]''
| 1889
| [[Denver Formation]], [[Evanston Formation]], [[Hell Creek Formation]], [[Lance Formation]], [[Laramie Formation]], [[Scollard Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}}<br />{{flag|Saskatchewan}}?)<br />{{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Montana}}<br />{{flag|South Dakota}}<br />{{flag|Wyoming}})
| A common ceratopsid with long brow horns and a short nasal horn
| [[File:Triceratops by Tom Patker.png|200px]]
|-
| ''[[Trierarchuncus]]''
| 2020
| [[Hell Creek Formation]] ([[Late Cretaceous]], [[Maastrichtian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Known from remains of different sizes which depict how the claws of alvarezsaurids grew more hooked as they aged
| [[File:Trierarchuncus prairiensis.png|200px]]
|-
| ''[[Troodon]]''
| 1856
| [[Judith River Formation]], [[Two Medicine Formation]]? ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Only known from teeth. Most referred skeletal remains cannot be confidently assigned to this genus<ref name=Polyodontosaurus />
| [[File:Troodon (cropped).jpg|200px]]
|-
| ''[[Tyrannosaurus]]''
| 1905
| [[Frenchman Formation]], [[Hall Lake Formation]], [[Hell Creek Formation]], [[Lance Formation]], [[Willow Creek Formation]] ([[Late Cretaceous]], [[Campanian]] to [[Maastrichtian]])
| {{flag|Canada}}<br />({{flag|Alberta}}<br />{{flag|Saskatchewan}})<br />{{flag|United States}}<br />({{flag|Colorado}}<br />{{flag|Montana}}<br />{{flag|New Mexico}}<br />{{flag|South Dakota}}<br />{{flag|Wyoming}})
| The last, largest and most well-known tyrannosaurid
| [[File:Tyrannosaurus-rex-Profile-steveoc86.png|200px]]
|-
| ''[[Unescoceratops]]''
| 2012
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Had the roundest teeth of any known leptoceratopsid
|
|-
| ''[[Utahceratops]]''
| 2010
| [[Kaiparowits Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Almost the entire skeleton is known, including the skull
| [[File:Utahceratops UDL.png|200px]]
|-
| ''[[Utahraptor]]''
| 1993
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Berriasian]] to [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Very large and powerfully built
| [[File:Utahraptor Restoration.png|200px]]
|-
| ''[[Uteodon]]''
| 2011
| [[Morrison Formation]] ([[Late Jurassic]], [[Tithonian]])
| {{flag|United States}}<br />({{flag|Utah}})
| May be a species of ''[[Camptosaurus]]'', with a referred braincase being from ''[[Dryosaurus]]''<ref>{{Cite journal|last1=Carpenter|first1=Kenneth|last2=Lamanna|first2=Matthew C.|date=2015|title=The Braincase Assigned to the Ornithopod Dinosaur Uteodon McDonald, 2011, Reassigned to Dryosaurus Marsh, 1894: Implications for Iguanodontian Morphology and Taxonomy|url=https://bioone.org/journals/annals-of-carnegie-museum/volume-83/issue-2/007.083.0201/The-Braincase-Assigned-to-the-Ornithopod-Dinosaur-Uteodon-McDonald-2011/10.2992/007.083.0201.full|journal=Annals of Carnegie Museum|volume=83|issue=2|pages=149–165|doi=10.2992/007.083.0201|s2cid=85612127|issn=0097-4463}}</ref> 
| [[File:Uteodon reconstruction raingerr.png|200px]]
|-
| ''[[Vagaceratops]]''
| 2010
| [[Dinosaur Park Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Possessed a row of fused epoccipitals folding over the top of the frill
| [[File:Vagaceratops NT.jpg|200px]]
|-
| ''[[Velafrons]]''
| 2007
| [[Cerro del Pueblo Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Mexico}}<br />({{flag|Coahuila}})
| May have had elongated neural spines similar to those of ''[[Hypacrosaurus|Hypacrosaurus altispinus]]''
| [[File:Life reconstruction of Velafrons coahuilensis.png|200px]]
|-
| ''[[Venenosaurus]]''
| 2001
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Utah}})
| Its skeleton has traits of both titanosaurs and more basal macronarians
|
|-
| ''[[Wendiceratops]]''
| 2015
| [[Oldman Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Had three pairs of enlarged, curved epiparietals at the very top of its frill
| [[File:Wendiceratops restoration.PNG|200px]]
|-
| ''[[Xenoceratops]]''
| 2012
| [[Foremost Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Canada}}<br />({{flag|Alberta}})
| Possessed two long spikes at the top of its frill with smaller knobs at their bases
| [[File:Xenoceratops NT small.jpg|200px]]
|-
| ''[[Yehuecauhceratops]]''
| 2017
| [[Aguja Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|Mexico}}<br />({{flag|Coahuila}})
| One of the smallest known ceratopsids
| [[File:Yehuecauhceratops.jpg|200px]]
|-
| ''[[Yurgovuchia]]''
| 2012
| [[Cedar Mountain Formation]] ([[Early Cretaceous]], [[Valanginian]])
| {{flag|United States}}<br />({{flag|Utah}})
| May have had a flexible tail due to the structure of its caudal vertebrae
| [[File:Yurgovuchia.jpg|200px]]
|-
| ''[[Zapsalis]]''
| 1876
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Some teeth referred to this genus actually belong to ''[[Saurornitholestes]]''<ref name=Saurornitholestes />
| [[File:Zapsalis.png|200px]]
|-
| ''[[Zephyrosaurus]]''
| 1980
| [[Cloverly Formation]] ([[Early Cretaceous]], [[Aptian]] to [[Albian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Currently only known from fragmentary remains but several undescribed specimens exist<ref>{{cite journal |last=Kutter |first=M.M. |year=2003 |title=New material of ''Zephyrosaurus schaffi'' (Dinosauria:Ornithischia) from the Cloverly Formation (Aptian-Albian) of Montana |journal=Journal of Vertebrate Paleontology |volume=23 |issue=3, Suppl |pages=69A| doi =10.1080/02724634.2003.10010538 |s2cid=220410105 }}</ref>
| [[File:Zephyrosaurus in Copenhagen.jpg|200px]]
|-
| ''[[Ziapelta]]''
| 2014
| [[Kirtland Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Many specimens are known, most from the front part of the animal
| [[File:Ziapelta.png|200px]]
|-
| ''[[Zuniceratops]]''
| 1998
| [[Moreno Hill Formation]] ([[Late Cretaceous]], [[Turonian]] to [[Coniacian]])
| {{flag|United States}}<br />({{flag|New Mexico}})
| Carried a pair of brow horns despite not being a member of the Ceratopsidae
| [[File:Zuniceratops BW.jpg|200px]]
|-
| ''[[Zuul]]''
| 2017
| [[Judith River Formation]] ([[Late Cretaceous]], [[Campanian]])
| {{flag|United States}}<br />({{flag|Montana}})
| Preserves several osteoderms, keratin and skin remains
| [[File:Zuul.jpg|200px]]
|}

=== Invalid and potentially valid genera<!--dinosaurs that have a note on [[List of dinosaur genera]] and/or redirect, or have their taxonomy template set outside Dinosauria or within Avialae--> ===
<gallery>
Agathaumas sylvestris.jpg|''[[Agathaumas]]''
Alcovasaurus longispinus.png|''[[Alcovasaurus]]''
Antrodemus.jpg|''[[Antrodemus]]''
Apatodon 250 445d.jpg|''[[Apatodon]]''
Capitalsaurus.jpg|"[[Capitalsaurus]]"
Cathetosaurus skeleton 1.jpg|''[[Cathetosaurus]]''
Coelosaurus antiquus tibia.jpg|"''[["Coelosaurus" antiquus|Coelosaurus]]''"
Deinodon.JPG|''[[Deinodon]]''
Dracorex BW.jpg|''[[Dracorex]]''
Drinker nisti (dinosaur) restoration.png|''[[Drinker nisti|Drinker]]''
Epanterias amplexus.jpg|''[[Epanterias]]''
Latenivenatrix.png|''[[Latenivenatrix]]''
Mojoceratops NT.jpg|''[[Mojoceratops]]''
Nanotyrannus NT.jpg|''[[Nanotyrannus]]''
Nedoceratops BW.jpg|''[[Nedoceratops]]''
Ojoceratops NT.jpg|''[[Ojoceratops]]''
Othnielia rex.jpg|''[[Othnielia]]''
Othnielosaurus.jpg|''[[Othnielosaurus]]''
Rhinorex condrupus.png|''[[Rhinorex]]''
Rubeosaurus ovatus.jpg|''[[Rubeosaurus]]''
Stygimoloch NT small.jpg|''[[Stygimoloch]]''
Tatankaceratops NT.jpg|''[[Tatankaceratops]]''
</gallery>
* ''[[Agathaumas|Agathaumas sylvestris]]'': Mostly well-known from a painting by [[Charles R. Knight]]. It may have been a synonym of ''[[Triceratops]]'', but without cranial remains, this cannot be confirmed.
* ''[[Alcovasaurus|Alcovasaurus longispinus]]'': Although originally named as a species of ''[[Stegosaurus]]'', it may actually be a species of the otherwise European ''[[Miragaia longicollum|Miragaia]]''. However, a later study has considered ''Miragaia'' a junior synonym of ''[[Dacentrurus]]'', making ''Alcovasaurus'' a potentially distinct genus.
* ''[[Antrodemus|Antrodemus valens]]'': May represent the same animal as ''[[Allosaurus]]''. If so, the name ''Antrodemus'' would have priority. However, because it is based on undiagnostic remains of uncertain provenance, this cannot be confirmed.
* ''[[Apatodon|Apatodon mirus]]'': Its holotype was originally believed to be the jawbone of a Mesozoic pig, but has been reinterpreted as a dinosaur vertebra. What type of dinosaur it belonged to is unknown, but there have been suggestions that it was from ''[[Allosaurus]]''.
* "[[List of informally named dinosaurs#Beelemodon|Beelemodon]]": Known only from two teeth found in Wyoming. They share features of compsognathids, dromaeosaurids and basal oviraptorosaurs.
* "[[List of informally named dinosaurs#Capitalsaurus|Capitalsaurus]]": The official dinosaur of the District of Columbia. It is known from a single vertebra discovered at the intersection of First and F Streets S.E., which is now appropriately named "Capitalsaurus Court".
* ''[[Cathetosaurus|Cathetosaurus lewisi]]'': Usually seen as a species of ''[[Camarasaurus]]'', but an unpublished study argues that it might be a distinct genus.
* ''[[Claorhynchus|Claorhynchus trihedrus]]'': An indeterminate cerapod that may be either a hadrosaurid or a ceratopsid, in which case it may be a synonym of ''[[Triceratops]]''.
* "[["Coelosaurus" antiquus|Coelosaurus]]" ''[["Coelosaurus" antiquus|antiquus]]'': The generic name is said to be preoccupied, but its namesake remains obscure.
* "[[List of informally named dinosaurs#Comanchesaurus|Comanchesaurus kuesi]]": Only named in a dissertation. It has been described as a possible indeterminate saurischian.
* ''[[Deinodon|Deinodon horridus]]'': Only known from teeth. Several referred teeth have since been found to belong to already known species, and the holotype itself could belong to ''[[Gorgosaurus]]''.
* ''[[Dracorex|Dracorex hogwartsia]]'': Described as a small, flat-headed pachycephalosaur. However, it is likely that it is just a juvenile ''[[Pachycephalosaurus]]''.
* ''[[Drinker nisti]]'': May be a synonym of ''[[Nanosaurus]]''.
* ''[[Epanterias|Epanterias amplexus]]'': Possibly a large specimen of ''[[Allosaurus]]'', but it may be a different taxon due to its younger age.
* ''[[Latenivenatrix|Latenivenatrix mcmasterae]]'': The largest known troodontid. It is sometimes suggested to be synonymous with ''[[Stenonychosaurus]]'', which its remains were originally assigned to.
* "[[List of informally named dinosaurs#Magulodon|Magulodon muirkirkensis]]": Only known from a single tooth that may belong to either an ornithopod or a basal ceratopsian.
* "[[List of informally named dinosaurs#Microcephale|Microcephale]]": Said to be an extremely small pachycephalosaur, with skull caps only {{convert|5|cm|in}} long.
* ''[[Mojoceratops|Mojoceratops perifania]]'': May be a synonym of ''[[Chasmosaurus]]''.
* ''[[Nanotyrannus|Nanotyrannus lancensis]]'': Most likely a juvenile ''[[Tyrannosaurus]]'', although a more recent study suggests it might be a possibly distinct taxon based on referred specimens.
* ''[[Nedoceratops|Nedoceratops hatcheri]]'': Due to its lack of a nasal horn, it has been named "''Diceratops''" (which is preoccupied by [[Syzeuctus|an insect]]) and ''Diceratus''. However, it may simply be an unusual specimen of ''[[Triceratops]]''.
* ''[[Ojoceratops|Ojoceratops fowleri]]'': May be ancestral to ''[[Triceratops]]'' or a synonym of ''[[Eotriceratops]]''.
* "[[List of informally named dinosaurs#Orcomimus|Orcomimus]]": Potentially attributable to any of the ornithomimosaur taxa known from the Hell Creek Formation.
* ''[[Othnielia|Othnielia rex]]'': Only known from an undiagnostic femur, but it may have belonged to ''[[Nanosaurus]]'' anyway.
* ''[[Othnielosaurus|Othnielosaurus consors]]'': Most likely a synonym of ''[[Nanosaurus]]''.
* ''[[Palaeopteryx|Palaeopteryx thomsoni]]'': Known from a few very small bones which could belong to either a bird or a small bird-like dinosaur.
* ''[[Protoavis|Protoavis texensis]]'': Described as a Triassic bird but is most likely a chimera consisting of elements from various unrelated tetrapods.
* ''[[Rhinorex|Rhinorex condrupus]]'': Phylogenetic analysis shows that it may fall within ''[[Gryposaurus]]'', and thus be a junior synonym of that genus.
* ''[[Rubeosaurus|Rubeosaurus ovatus]]'': Likely a species of ''[[Styracosaurus]]'', or even simply an unusual specimen of ''S. albertensis''.
* ''[[Stygimoloch|Stygimoloch spinifer]]'': Had a short skull dome with long horns jutting out from behind it. It is usually thought to be a subadult ''[[Pachycephalosaurus]]'', but has been noted to be stratigraphically younger.
* ''[[Tatankaceratops|Tatankaceratops sacrisonorum]]'': Noted to possess a strange mix of features of both juvenile and adult ''[[Triceratops]]''. It may be a dwarf specimen of that genus or an individual that stopped growing prematurely.

==Timeline==
This is a timeline of selected dinosaurs from the list above. Time is measured in [[annum|Ma]], [[annum|megaannum]], along the x-axis.

<timeline>
ImageSize  = width:800px height:auto barincrement:15px
PlotArea   = left:10px bottom:50px top:10px right:10px

Period      = from:-251.902 till:-25
TimeAxis    = orientation:horizontal
ScaleMajor  = unit:year increment:25 start:-25
ScaleMinor  = unit:year increment:5 start:-251.902
TimeAxis    = orientation:hor
AlignBars   = justify

Colors =
 #legends
  id:CAR	  value:claret
  id:HER	  value:teal
  id:OMN	  value:blue
  id:black        value:black
  id:white        value:white
  id:cretaceous   value:rgb(0.3,0.75,0.1)
  id:jurassic     value:rgb(0.3,0.75,0.4) 
  id:triassic     value:rgb(0.3,0.75,0.7) 
  id:mesozoic     value:rgb(0.3,0.6,0.4)
 
BarData=
 bar:eratop
 bar:space
 bar:periodtop
 bar:space
 bar:NAM1
 bar:NAM2
 bar:NAM3
 bar:NAM4
 bar:NAM5
 bar:NAM6
 bar:NAM7
 bar:NAM8
 bar:NAM9
 bar:NAM10
 bar:NAM11
 bar:NAM12
 bar:NAM13
 bar:NAM14
 bar:NAM15
 bar:NAM16
 bar:NAM17
 bar:NAM18
 bar:NAM19
 bar:NAM20
 bar:NAM21
 bar:NAM22
 bar:NAM23
 bar:NAM24
 bar:NAM25
 bar:NAM26
 bar:NAM27
 bar:NAM28
 bar:NAM29
 bar:NAM30
 bar:NAM31
 bar:NAM32
 bar:NAM33
 bar:NAM34
 bar:NAM35
 bar:NAM36
 bar:NAM37
 bar:NAM38
 bar:NAM39
 bar:NAM40
 bar:NAM41
 bar:NAM42
 bar:NAM43
 bar:NAM44
 bar:NAM45
 bar:NAM46
 bar:NAM47
 bar:NAM48
 bar:NAM49
 bar:NAM50
 bar:NAM51
 bar:NAM52
 bar:NAM53
 bar:NAM54
 bar:NAM55
 bar:NAM56
 bar:NAM57
 bar:NAM58
 bar:NAM59
 bar:NAM60
 bar:NAM61
 bar:NAM62
 bar:space
 bar:period
 bar:space
 bar:era

PlotData=
 align:center textcolor:black fontsize:M mark:(line,black) width:25 
 shift:(7,-4)

 bar:periodtop
 from: -145    till:  -66    color:cretaceous  text:[[Cretaceous]]             
 from: -201.3    till: -145    color:jurassic    text:[[Jurassic]]
 from: -251.902    till: -201.3   color:triassic    text:[[Triassic]]

 bar:eratop
 from:  -251.902   till:  -66    color:mesozoic    text:[[Mesozoic]]

PlotData=
 align:left fontsize:M mark:(line, white) width:5 anchor:till align:left

 color:CAR bar:NAM1  from:-216  till:-196 text:[[Coelophysis]]
 color:CAR bar:NAM2  from:-199  till:-188 text:[[Megapnosaurus]]
 color:HER bar:NAM3  from:-197  till:-195 text:[[Scutellosaurus]]
 color:HER bar:NAM4  from:-160  till:-150 text:[[Camptosaurus]]
 color:HER bar:NAM5  from:-156.3  till:-146.8 text:[[Brontosaurus]]
 color:HER bar:NAM6 from:-155  till:-145 text:[[Camarasaurus]]
 color:HER bar:NAM7 from:-155  till:-145 text:[[Dryosaurus]]
 color:CAR bar:NAM8  from:-155  till:-145 text:[[Allosaurus]]
 color:HER bar:NAM9  from:-155  till:-150 text:[[Stegosaurus]]
 color:HER bar:NAM10  from:-155  till:-152 text:[[Haplocanthosaurus]]
 color:HER bar:NAM13 from:-153  till:-147 text:[[Diplodocus]]
 color:CAR bar:NAM11 from:-153  till:-148 text:[[Ceratosaurus]]
 color:CAR bar:NAM12 from:-153  till:-148 text:[[Torvosaurus]]
 color:HER bar:NAM14 from:-153  till:-150 text:[[Barosaurus]]
 color:HER bar:NAM15  from:-153  till:-150 text:[[Apatosaurus]]
 color:CAR bar:NAM16 from:-152 till:-148 text:[[Saurophaganax]]
 color:HER bar:NAM17 from:-150  till:-145 text:[[Brachiosaurus]]
 color:CAR bar:NAM18 from:-150  till:-145 text:[[Ornitholestes]]
 color:OMN bar:NAM19 from:-130  till:-125 text:[[Falcarius]]
 color:CAR bar:NAM20 from:-130  till:-125 text:[[Yurgovuchia]]
 color:CAR bar:NAM21 from:-128.5  till:-126 text:[[Utahraptor]]
 color:CAR bar:NAM22 from:-116  till:-110 text:[[Acrocanthosaurus]]
 color:CAR bar:NAM23 from:-115  till:-108 text:[[Deinonychus]]
 color:HER bar:NAM24 from:-115  till:-108 text:[[Tenontosaurus]]
 color:HER bar:NAM25 from:-112  till:-108 text:[[Sauroposeidon]]
 color:HER bar:NAM26 from:-93   till:-91  text:[[Zuniceratops]]
 color:HER bar:NAM27 from:-87   till:-82  text:[[Niobrarasaurus]]
 color:HER bar:NAM28 from:-83   till:-74  text:[[Gryposaurus]]
 color:HER bar:NAM29 from:-79   till:-77  text:[[Brachylophosaurus]]
 color:HER bar:NAM30 from:-77.5   till:-74  text:[[Stegoceras]]
 color:OMN bar:NAM31 from:-77.5   till:-75.5  text:[[Troodon]]
 color:CAR bar:NAM32 from:-77.1   till:-74.1  text:[[Gorgosaurus]]
 color:HER bar:NAM33 from:-77   till:-73  text:[[Centrosaurus]]
 color:HER bar:NAM34 from:-77   till:-73  text:[[Corythosaurus]]
 color:HER bar:NAM35 from:-77   till:-74  text:[[Lambeosaurus]]
 color:HER bar:NAM36 from:-77   till:-74  text:[[Monoclonius]]
 color:HER bar:NAM37 from:-77   till:-66  text:[[Edmontonia]]
 color:HER bar:NAM38 from:-76.5   till:-66.5  text:[[Ornithomimus]]
 color:HER bar:NAM39 from:-76.5   till:-73  text:[[Parasaurolophus]]
 color:HER bar:NAM40 from:-76.5   till:-74  text:[[Styracosaurus]]
 color:HER bar:NAM41 from:-75.79   till:-73  text:[[Pentaceratops]]
 color:OMN bar:NAM42 from:-75   till:-66  text:[[Struthiomimus]]
 color:HER bar:NAM43 from:-75   till:-67  text:[[Hypacrosaurus]]
 color:HER bar:NAM44 from:-75   till:-73  text:[[Brachyceratops]]
 color:HER bar:NAM45 from:-74.5   till:-72  text:[[Ziapelta]]
 color:HER bar:NAM46 from:-74   till:-66  text:[[Kritosaurus]]
 color:HER bar:NAM47 from:-73   till:-69  text:[[Edmontosaurus regalis]]
 color:HER bar:NAM48 from:-73   till:-71  text:[[Velafrons]]
 color:HER bar:NAM49 from:-73   till:-70  text:[[Anchiceratops]]
 color:CAR bar:NAM50 from:-71   till:-68  text:[[Albertosaurus]]
 color:HER bar:NAM51 from:-71   till:-69  text:[[Montanoceratops]]
 color:HER bar:NAM52 from:-70   till:-66  text:[[Alamosaurus]]
 color:HER bar:NAM53 from:-70   till:-66  text:[[Pachycephalosaurus]]
 color:HER bar:NAM54 from:-70   till:-68.5  text:[[Saurolophus]]
 color:HER bar:NAM55 from:-69   till:-66  text:[[Eotriceratops]]
 color:HER bar:NAM56 from:-68   till:-66  text:[[Torosaurus]]
 color:HER bar:NAM57 from:-68   till:-66  text:[[Triceratops]]
 color:HER bar:NAM58 from:-68   till:-66  text:[[Ankylosaurus]]
 color:CAR bar:NAM59 from:-68   till:-66  text:[[Tyrannosaurus]]
 color:HER bar:NAM60 from:-68   till:-66  text:[[Thescelosaurus]]
 color:HER bar:NAM61 from:-68   till:-66  text:[[Edmontosaurus annectens]]
 color:HER bar:NAM62 from:-68  till:-66  text:[[Leptoceratops]]
PlotData=
 align:center textcolor:black fontsize:M mark:(line,black) width:25 
  
 bar:period
 from: -145    till:  -66    color:cretaceous  text:[[Cretaceous]]             
 from: -201.3    till: -145    color:jurassic    text:[[Jurassic]]
 from: -251.902    till: -201.3    color:triassic    text:[[Triassic]]

 bar:era
 from:  -251.902   till:  -66    color:mesozoic    text:[[Mesozoic]] 
</timeline>

== See also ==

* [[List of Appalachian dinosaurs]] - for dinosaurs specifically known from the former landmass of [[Appalachia (landmass)|Appalachia]] (where much of eastern North America is now)
{{Portal bar|Dinosaurs|North America}}
* [[List of North American birds]]

== References ==
{{Reflist}}

{{Dinosaurs by Continent}}

[[Category:Mesozoic dinosaurs of North America|*]]
[[Category:Lists of dinosaurs by landmass|North America]]
[[Category:Lists of animals of North America|†Dinosaurs]]
[[Category:Extinct animals of North America|.]]
[[Category:Articles which contain graphical timelines]]
[[Category:Articles containing video clips]]
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