List of dinosaur genera

This list of dinosaurs is a comprehensive listing of all genera that have ever been included in the superorder Dinosauria, excluding class Aves (birds, both living and those known only from fossils) and purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomen dubium), or were not formally published (nomen nudum), as well as junior synonyms of more established names, and genera that are no longer considered dinosaurs. Many listed names have been reclassified as everything from birds to crocodilians to petrified wood. The list contains 1442 names, of which approximately 1095 are considered either valid dinosaur genera or nomina dubia.

Scope and terminology
There is no official, canonical list of dinosaur genera. The closest is the Dinosaur Genera List, compiled by biological nomenclature expert George Olshevsky, which was first published online in 1995 and is regularly updated. The most authoritative general source in the field is the second (2004) edition of The Dinosauria. The vast majority of citations are based on Olshevsky's list, and all subjective determinations (such as junior synonymy or non-dinosaurian status) are based on The Dinosauria, except where they conflict with primary literature. These exceptions are noted.

Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include:
 * Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type specimens are later assigned to the same genus, the first to be published (in chronological order) is the senior synonym, and all other instances are junior synonyms. Senior synonyms are generally used, except by special decision of the ICZN (see Tyrannosaurus), but junior synonyms cannot be used again, even if deprecated. Junior synonymy is often subjective, unless the genera described were both based on the same type specimen.
 * Nomen nudum (Latin for "naked name"): A name that has appeared in print but has not yet been formally published by the standards of the ICZN. Nomina nuda (the plural form) are invalid, and are therefore not italicized as a proper generic name would be. If the name is later formally published, that name is no longer a nomen nudum and will be italicized on this list. Often, the formally published name will differ from any nomina nuda that describe the same specimen.
 * Nomen oblitum (Latin for "forgotten name"): A name that has not been used in the scientific community for more than fifty years after its original proposal.
 * Preoccupied name: A name that is formally published, but which has already been used for another taxon. This second use is invalid (as are all subsequent uses) and the name must be replaced. Preoccupied names are not valid generic names.
 * Nomen dubium (Latin for "dubious name"): A name describing a fossil with no unique diagnostic features. As this can be an extremely subjective and controversial designation (see Hadrosaurus), this term is not used on this list.

A

 * Aachenosaurus – actually a piece of petrified wood
 * Aardonyx
 * "Abdallahsaurus" – nomen nudum, probably Giraffatitan
 * Abelisaurus
 * Abrictosaurus
 * Abrosaurus
 * Abydosaurus
 * Acanthopholis
 * Achelousaurus
 * Acheroraptor
 * Achillesaurus
 * Achillobator
 * Acristavus
 * Acrocanthosaurus
 * Acrotholus
 * Actiosaurus – actually a choristoderan
 * Adamantisaurus
 * Adasaurus
 * Adeopapposaurus
 * Aegyptosaurus
 * Aeolosaurus
 * Aepisaurus
 * Aerosteon
 * Aetonyx – possible junior synonym of Massospondylus
 * Afrovenator
 * Agathaumas
 * Aggiosaurus – actually a metriorhynchid crocodilian
 * Agilisaurus
 * Agnosphitys
 * Agrosaurus – probably a junior synonym of Thecodontosaurus
 * Agujaceratops
 * Agustinia
 * Ahshislepelta
 * Ajancingenia
 * Ajkaceratops
 * Alamosaurus
 * Alaskacephale
 * Albalophosaurus
 * Albertaceratops
 * Albertadromeus
 * Albertonykus
 * Albertosaurus
 * Albinykus
 * Albisaurus – a non-dinosaurian reptile
 * Alectrosaurus
 * Aletopelta
 * Algoasaurus
 * Alioramus
 * Aliwalia – junior synonym of Eucnemesaurus
 * Allosaurus
 * Alnashetri
 * Alocodon
 * Altirhinus
 * Altispinax
 * Alvarezsaurus
 * Alwalkeria
 * Alxasaurus
 * Amargasaurus
 * Amargatitanis
 * Amazonsaurus
 * Ammosaurus
 * Ampelosaurus
 * Amphicoelias
 * "Amphicoelicaudia" – nomen nudum; possibly Huabeisaurus
 * "Amphisaurus" – preoccupied name, now known as Anchisaurus
 * Amtocephale
 * Amtosaurus – possibly Talarurus
 * Amurosaurus
 * Amygdalodon
 * Anabisetia
 * Anasazisaurus
 * Anatosaurus – junior synonym of Edmontosaurus
 * Anatotitan – junior synonym of Edmontosaurus
 * Anchiceratops
 * Anchiornis
 * Anchisaurus
 * Andesaurus
 * Angaturama – probable junior synonym of Irritator
 * "Angloposeidon" – nomen nudum
 * Angolatitan
 * Angulomastacator
 * Aniksosaurus
 * Animantarx
 * Ankistrodon – actually a proterosuchid archosauriform
 * Ankylosaurus
 * Anodontosaurus
 * Anoplosaurus
 * Anserimimus
 * Antarctopelta
 * Antarctosaurus
 * Antetonitrus
 * Anthodon – actually a pareiasaur
 * Antrodemus – possibly a junior synonym of Allosaurus
 * Anzu
 * Aorun
 * Apatodon – possibly a junior synonym of Allosaurus
 * Apatosaurus – popularly known as Brontosaurus
 * Appalachiosaurus
 * Aragosaurus
 * Aralosaurus
 * "Araucanoraptor" – nomen nudum; Neuquenraptor
 * Archaeoceratops
 * Archaeodontosaurus
 * Archaeopteryx – earliest known bird
 * "Archaeoraptor" – now known as the bird Yanornis and the dromaeosaur Microraptor
 * Archaeornis – junior synonym of the bird Archaeopteryx
 * Archaeornithoides
 * Archaeornithomimus
 * Archaeovolans – junior synonym of the bird Yanornis
 * Arcovenator
 * Arctosaurus – actually some sort of non-dinosaurian reptile
 * Arcusaurus
 * Arenysaurus
 * Argentinosaurus
 * Argyrosaurus
 * Aristosaurus – junior synonym of Massospondylus
 * Aristosuchus
 * Arizonasaurus – actually a rauisuchian
 * "Arkansaurus" – nomen nudum
 * Arkharavia
 * Arrhinoceratops
 * Arstanosaurus
 * Asiaceratops
 * Asiamericana
 * Asiatosaurus
 * Astrodon
 * Astrodonius – junior synonym of Astrodon
 * Astrodontaurus – junior synonym of Astrodon
 * Astrophocaudia
 * Asylosaurus
 * Atacamatitan
 * Atlantosaurus
 * Atlasaurus
 * Atlascopcosaurus
 * Atrociraptor
 * Atsinganosaurus
 * Aublysodon
 * Aucasaurus
 * "Augustia" – preoccupied name, now known as Agustinia
 * Augustynolophus
 * Auroraceratops
 * Aurornis
 * Australodocus
 * Australovenator
 * Austrocheirus
 * Austroraptor
 * Austrosaurus
 * Avaceratops
 * "Avalonia" – preoccupied name, now known as Avalonianus
 * Avalonianus – actually a non-dinosaurian archosaur
 * Aviatyrannis
 * Avimimus
 * Avipes – probably a non-dinosaurian dinosauromorph
 * Avisaurus – actually an enantiornithine bird
 * Azendohsaurus – a non-dinosaurian archosauromorph

B

 * Bactrosaurus
 * Bagaceratops
 * Bagaraatan
 * Bahariasaurus
 * Bainoceratops
 * "Bakesaurus" – nomen nudum
 * Balaur
 * Balochisaurus
 * Bambiraptor
 * Banji
 * Baotianmansaurus
 * Barapasaurus
 * Barilium
 * Barosaurus
 * Barrosasaurus
 * Barsboldia
 * Baryonyx
 * "Bashunosaurus" – nomen nudum
 * Basutodon – actually a non-dinosaurian archosaur
 * Bathygnathus – actually a pelycosaur
 * Batyrosaurus
 * Baurutitan
 * "Bayosaurus" – nomen nudum
 * Becklespinax
 * "Beelemodon" – nomen nudum
 * Beipiaosaurus
 * Beishanlong
 * Bellusaurus
 * Belodon – actually a phytosaur
 * Berberosaurus
 * Betasuchus
 * Bicentenaria
 * Bienosaurus
 * Bihariosaurus
 * "Bilbeyhallorum" – nomen nudum; Cedarpelta
 * Bissektipelta
 * Bistahieversor
 * "Blancocerosaurus" – nomen nudum, probably Giraffatitan
 * Blasisaurus
 * Blikanasaurus
 * Bolong
 * Bonapartenykus
 * Bonatitan
 * Bonitasaura
 * Borealosaurus
 * Borogovia
 * Bothriospondylus
 * Brachiosaurus
 * Brachyceratops
 * Brachylophosaurus
 * Brachypodosaurus
 * Brachyrophus – junior synonym of Camptosaurus
 * Brachytaenius – actually a metriorhynchid; junior objective synonym of Dakosaurus
 * Brachytrachelopan
 * Bradycneme
 * Brasileosaurus – actually a non-dinosaurian archosaur
 * Brasilotitan
 * Bravoceratops
 * Breviceratops
 * Brohisaurus
 * Brontomerus
 * "Brontoraptor" – nomen nudum
 * Brontosaurus – junior synonym of Apatosaurus
 * Bruhathkayosaurus
 * Bugenasaura – junior synonym of Thescelosaurus
 * Buitreraptor
 * "Byranjaffia" – nomen nudum; Byronosaurus
 * Byronosaurus

C

 * Caenagnathasia
 * Caenagnathus
 * Calamosaurus
 * Calamospondylus Fox, 1866
 * "Calamospondylus" Lydekker, 1889 – preoccupied name, now known as Calamosaurus
 * Callovosaurus
 * Camarasaurus
 * Camarillasaurus
 * Camelotia
 * Camposaurus
 * "Camptonotus" – preoccupied name, now known as Camptosaurus
 * Camptosaurus
 * "Campylodon" – preoccupied name, now known as Campylodoniscus
 * Campylodoniscus
 * Canardia
 * "Capitalsaurus" – nomen nudum
 * Carcharodontosaurus
 * Cardiodon
 * "Carnosaurus" – nomen nudum, probably a typographical error for "carnosaur"
 * Carnotaurus
 * Caseosaurus
 * Cathartesaura
 * Cathetosaurus
 * Caudipteryx
 * Caudocoelus – junior synonym of Teinurosaurus
 * Caulodon – junior synonym of Camarasaurus
 * Cedarosaurus
 * Cedarpelta
 * Cedrorestes
 * Centemodon – actually a phytosaur
 * Centrosaurus
 * Cerasinops
 * Ceratonykus
 * Ceratops
 * Ceratosaurus
 * Cetiosauriscus
 * Cetiosaurus
 * Changchunsaurus
 * "Changdusaurus" – nomen nudum
 * "Changtusaurus" – variant spelling of "Changdusaurus"
 * Changyuraptor
 * Chaoyangsaurus
 * Charonosaurus
 * Chasmosaurus
 * Chassternbergia – junior synonym of Edmontonia
 * Chebsaurus
 * Cheneosaurus – junior synonym of Hypacrosaurus
 * Chialingosaurus
 * Chiayusaurus
 * Chienkosaurus – actually a chimera of crocodilian and theropod (Szechuanosaurus) remains
 * "Chihuahuasaurus" – nomen nudum; Sonorasaurus
 * Chilantaisaurus
 * Chindesaurus
 * Chingkankousaurus
 * Chinshakiangosaurus
 * Chirostenotes
 * Chondrosteosaurus
 * Chromogisaurus
 * Chuandongocoelurus
 * Chuanjiesaurus
 * Chuanqilong
 * Chubutisaurus
 * Chungkingosaurus
 * Chuxiongosaurus
 * "Cinizasaurus" – nomen nudum
 * Cionodon
 * Citipati
 * Cladeiodon – actually a non-dinosaurian rauisuchian (Teratosaurus)
 * Claorhynchus – possibly Triceratops
 * Claosaurus
 * Clarencea – actually a sphenosuchian (Sphenosuchus)
 * Clasmodosaurus
 * Clepsysaurus – actually a phytosaur
 * Coahuilaceratops
 * Coelophysis
 * "Coelosaurus" – preoccupied name, in need of a replacement name
 * Coeluroides
 * Coelurosauravus – actually an avicephalan diapsid
 * "Coelurosaurus" – nomen nudum, probably a typographical error for "coelurosaur"
 * Coelurus
 * Colepiocephale
 * Colonosaurus – junior synonym of the bird Ichthyornis dispar
 * "Coloradia" – preoccupied name, now known as Coloradisaurus
 * Coloradisaurus
 * "Colossosaurus" – nomen nudum; Pelorosaurus
 * Comahuesaurus
 * "Comanchesaurus" – nomen nudum
 * Compsognathus
 * Compsosuchus
 * Concavenator
 * Conchoraptor
 * Condorraptor
 * Coronosaurus
 * Corythosaurus
 * Craspedodon
 * Crataeomus – junior synonym of Struthiosaurus
 * Craterosaurus
 * Creosaurus – junior synonym of Allosaurus
 * Crichtonsaurus
 * Cristatusaurus
 * Crosbysaurus – actually a non-dinosaurian archosauriform
 * Cruxicheiros
 * Cryolophosaurus
 * Cryptodraco – junior synonym (unneeded replacement name) of Cryptosaurus
 * "Cryptoraptor" – nomen nudum
 * Cryptosaurus
 * Cryptovolans – junior synonym of Microraptor
 * Cumnoria

D

 * Daanosaurus
 * Dacentrurus
 * "Dachongosaurus" – nomen nudum
 * "Dachungosaurus" – variant spelling of "Dachongosaurus"
 * Daemonosaurus
 * Dahalokely
 * Dakosaurus – actually a metriorhynchid crocodilian
 * Dakotadon
 * "Damalasaurus" – nomen nudum
 * Dandakosaurus
 * Danubiosaurus – junior synonym of Struthiosaurus
 * "Daptosaurus" – nomen nudum; early manuscript name for Deinonychus
 * Darwinsaurus
 * Dashanpusaurus
 * Daspletosaurus
 * Dasygnathoides – actually a non-dinosaurian archosaur, junior synonym of Ornithosuchus
 * "Dasygnathus" – preoccupied name, now known as Dasygnathoides
 * Datanglong
 * Datousaurus
 * Daurosaurus
 * Daxiatitan
 * Deinocheirus
 * Deinodon – possibly Gorgosaurus
 * Deinonychus
 * Delapparentia
 * Deltadromeus
 * Demandasaurus
 * Denversaurus – junior synonym of Edmontonia
 * Deuterosaurus – actually a therapsid
 * Diabloceratops
 * Diamantinasaurus
 * Dianchungosaurus – actually a crocodilian
 * "Diceratops" – preoccupied name, now known as Nedoceratops
 * Diceratus – junior synonym of Nedoceratops
 * Diclonius
 * Dicraeosaurus
 * Didanodon – possibly a junior synonym of Lambeosaurus
 * Dilong
 * Dilophosaurus
 * Dimodosaurus – junior synonym of Plateosaurus
 * Dinheirosaurus
 * Dinodocus
 * "Dinosaurus" – preoccupied name, now a junior synonym of Plateosaurus
 * Dinotyrannus – junior synonym of Tyrannosaurus
 * Diplodocus
 * Diplotomodon
 * Diracodon – junior synonym of Stegosaurus
 * Dolichosuchus
 * Dollodon
 * "Domeykosaurus" – nomen nudum
 * Dongbeititan
 * Dongyangopelta
 * Dongyangosaurus
 * Doratodon – actually a crocodilian
 * Doryphorosaurus – junior synonym (unneeded replacement name) of Kentrosaurus
 * Draconyx
 * Dracopelta
 * Dracorex – possibly a juvenile Pachycephalosaurus
 * Dracovenator
 * Dravidosaurus – actually a plesiosaurian
 * Dreadnoughtus
 * Drinker
 * Dromaeosauroides
 * Dromaeosaurus
 * Dromiceiomimus
 * Dromicosaurus – junior synonym of Massospondylus
 * Drusilasaura
 * Dryosaurus
 * Dryptosauroides
 * Dryptosaurus
 * Dubreuillosaurus
 * Duriatitan
 * Duriavenator
 * Dynamosaurus – junior synonym of Tyrannosaurus
 * Dyoplosaurus
 * Dysalotosaurus
 * Dysganus
 * Dyslocosaurus
 * Dystrophaeus
 * Dystylosaurus – junior synonym of Supersaurus

E

 * Echinodon
 * Edmarka
 * Edmontonia
 * Edmontosaurus
 * Efraasia
 * Einiosaurus
 * Ekrixinatosaurus
 * Elachistosuchus – a rhynchocephalian
 * Elaltitan
 * Elaphrosaurus
 * Elmisaurus
 * Elopteryx
 * Elosaurus – junior synonym of Apatosaurus
 * Elrhazosaurus
 * "Elvisaurus" – nomen nudum; Cryolophosaurus
 * Emausaurus
 * Embasaurus
 * Enigmosaurus
 * Eoabelisaurus
 * Eobrontosaurus
 * Eocarcharia
 * Eoceratops – junior synonym of Chasmosaurus
 * Eocursor
 * Eodromaeus
 * "Eohadrosaurus" – nomen nudum; Eolambia
 * Eolambia
 * Eolosaurus – junior synonym of Aeolosaurus
 * Eomamenchisaurus
 * Eoraptor
 * Eosinopteryx
 * Eotriceratops
 * Eotyrannus
 * Eousdryosaurus
 * Epachthosaurus
 * Epanterias – may be Allosaurus
 * "Ephoenosaurus" – nomen nudum; Machimosaurus (a crocodilian)
 * Epicampodon – actually a proterosuchid archosauriform
 * Epichirostenotes
 * Epidendrosaurus
 * Epidexipteryx
 * Equijubus
 * Erectopus
 * ''Erketu
 * Erliansaurus
 * Erlikosaurus
 * Eshanosaurus
 * "Euacanthus" – nomen nudum; junior synonym of Polacanthus
 * Eucamerotus
 * Eucentrosaurus – junior synonym (unneeded replacement name) of Centrosaurus
 * Eucercosaurus
 * Eucnemesaurus
 * Eucoelophysis – actually a silesaurid
 * "Eugongbusaurus" – nomen nudum
 * Euhelopus
 * Euoplocephalus
 * Eupodosaurus – a nothosaur synonymous with Lariosaurus
 * "Eureodon" – nomen nudum; Tenontosaurus
 * Eurolimnornis – actually a pterosaur
 * Euronychodon
 * Europasaurus
 * Europelta
 * Euskelosaurus
 * Eustreptospondylus

F

 * Fabrosaurus – possibly Lesothosaurus
 * Falcarius
 * "Fenestrosaurus" – nomen nudum; Oviraptor
 * Ferganasaurus
 * Ferganocephale
 * Frenguellisaurus – junior synonym of Herrerasaurus
 * Fruitadens
 * Fukuiraptor
 * Fukuisaurus
 * Fukuititan
 * Fulengia
 * Fulgurotherium
 * "Fusinasus" – nomen nudum; Eotyrannus
 * Fusuisaurus
 * "Futabasaurus" – nomen nudum; not to be confused with the formally named plesiosaur Futabasaurus
 * Futalognkosaurus

G

 * "Gadolosaurus" – nomen nudum
 * Galesaurus – actually a therapsid
 * Gallimimus
 * Galtonia – actually a pseudosuchian; possibly a junior synonym of Revueltosaurus
 * Galveosaurus
 * Galvesaurus – junior synonym of Galveosaurus
 * Gannansaurus
 * "Gansutitan" - nomen nudum; Daxiatitan
 * Ganzhousaurus
 * Gargoyleosaurus
 * Garudimimus
 * Gasosaurus
 * Gasparinisaura
 * Gastonia
 * "Gavinosaurus" – nomen nudum; Eotyrannus
 * Geminiraptor
 * Genusaurus
 * Genyodectes
 * Geranosaurus
 * Gideonmantellia
 * Giganotosaurus
 * Gigantoraptor
 * Gigantosaurus Seeley, 1869
 * "Gigantosaurus" E. Fraas, 1908 – preoccupied name, now known as Tornieria
 * Gigantoscelus – junior synonym of Euskelosaurus
 * Gigantspinosaurus
 * Gilmoreosaurus
 * "Ginnareemimus" – nomen nudum; Kinnareemimus
 * Giraffatitan
 * Glacialisaurus
 * Glishades
 * Glyptodontopelta
 * Gobiceratops
 * Gobipteryx – actually an enantiornithine bird
 * Gobisaurus
 * Gobititan
 * Gobivenator
 * "Godzillasaurus" – nomen nudum; Gojirasaurus
 * Gojirasaurus
 * Gondwanatitan
 * Gongbusaurus
 * Gongxianosaurus
 * Gorgosaurus
 * Goyocephale
 * Graciliceratops
 * Graciliraptor
 * Gracilisuchus – actually a non-dinosaurian archosaur
 * Gravitholus
 * Gresslyosaurus – junior synonym of Plateosaurus
 * Griphornis – junior synonym of the bird Archaeopteryx
 * Griphosaurus – junior synonym of the bird Archaeopteryx
 * Gryphoceratops
 * Gryponyx
 * Gryposaurus
 * Guaibasaurus
 * Guanlong
 * Gwyneddosaurus – a tanystrophid
 * Gyposaurus – junior synonym of Massospondylus

H

 * "Hadrosauravus" – nomen nudum; junior synonym of Gryposaurus
 * Hadrosaurus
 * Hagryphus
 * Hallopus – actually a crocodilian
 * Halticosaurus
 * Hanssuesia
 * "Hanwulosaurus" – nomen nudum
 * Haplocanthosaurus
 * "Haplocanthus" – preoccupied name, now known as Haplocanthosaurus
 * Haplocheirus
 * Harpymimus
 * Haya
 * Hecatasaurus – junior synonym of Telmatosaurus
 * "Heilongjiangosaurus" – nomen nudum
 * Heishansaurus – junior synonym of Pinacosaurus
 * Helioceratops
 * "Helopus" – preoccupied name, now known as Euhelopus
 * Heptasteornis
 * Herbstosaurus – actually a pterosaur
 * Herrerasaurus
 * Hesperonychus
 * Hesperosaurus
 * Heterodontosaurus
 * Heterosaurus
 * Hexing
 * Hexinlusaurus
 * Heyuannia
 * Hierosaurus
 * Hippodraco
 * "Hironosaurus" – nomen nudum
 * "Hisanohamasaurus" – nomen nudum
 * Histriasaurus
 * Homalocephale
 * "Honghesaurus" – nomen nudum; Yandusaurus
 * Hongshanosaurus
 * Hoplitosaurus
 * Hoplosaurus – junior synonym of Struthiosaurus
 * Hortalotarsus – junior synonym of Massospondylus
 * Huabeisaurus
 * Huanghetitan
 * Huaxiagnathus
 * Huaxiaosaurus
 * "Huaxiasaurus" – nomen nudum; Huaxiagnathus
 * Huayangosaurus
 * Hudiesaurus
 * Huehuecanauhtlus
 * Hulsanpes – possibly a bird
 * Hungarosaurus
 * Huxleysaurus
 * Hylaeosaurus
 * Hylosaurus – junior synonym of Hylaeosaurus
 * Hypacrosaurus
 * Hypselorhachis – actually a ctenosauriscid
 * Hypselosaurus
 * Hypselospinus
 * Hypsibema
 * Hypsilophodon
 * Hypsirophus – probable junior synonym of Stegosaurus

I

 * "Ichabodcraniosaurus" – nomen nudum; probably Velociraptor
 * Ichthyovenator
 * Ignavusaurus
 * Iguanacolossus
 * Iguanodon
 * "Iguanoides" – nomen nudum; Iguanodon
 * "Iguanosaurus" – nomen nudum; Iguanodon
 * Iliosuchus
 * Ilokelesia
 * Incisivosaurus
 * Indosaurus
 * Indosuchus
 * "Ingenia" – preoccupied name, now known as Ajancingenia
 * Inosaurus
 * Irritator
 * Isanosaurus
 * Ischisaurus – junior synonym of Herrerasaurus
 * "Ischyrosaurus" – preoccupied name, has not yet been renamed
 * Isisaurus
 * "Issasaurus" – nomen nudum; Dicraeosaurus
 * Itemirus
 * Iuticosaurus

J

 * Jainosaurus
 * Jaklapallisaurus
 * Janenschia
 * Jaxartosaurus
 * Jeholornis – actually a bird
 * Jeholosaurus
 * Jenghizkhan – junior synonym of Tarbosaurus
 * "Jensenosaurus" – nomen nudum; Supersaurus
 * Jeyawati
 * Jianchangosaurus
 * "Jiangjunmiaosaurus" – nomen nudum; Monolophosaurus
 * Jiangjunosaurus
 * Jiangshanosaurus
 * Jiangxisaurus
 * Jinfengopteryx
 * Jingshanosaurus
 * Jintasaurus
 * Jinzhousaurus
 * Jiutaisaurus
 * Jixiangornis – actually a bird
 * Jobaria
 * Jubbulpuria
 * Judiceratops
 * Jurapteryx – junior synonym of the bird Archaeopteryx
 * "Jurassosaurus" – nomen nudum; Tianchisaurus
 * Juratyrant
 * Juravenator

K

 * Kaatedocus
 * "Kagasaurus" – nomen nudum
 * Kaijiangosaurus
 * Kakuru
 * Kangnasaurus
 * Karongasaurus
 * Katepensaurus
 * "Katsuyamasaurus" – nomen nudum
 * Kayentavenator
 * Kazaklambia
 * Kelmayisaurus
 * Kemkemia
 * Kentrosaurus
 * Kentrurosaurus – junior synonym (unneeded replacement name) of Kentrosaurus
 * Kerberosaurus
 * Khaan
 * Khetranisaurus
 * Kileskus
 * Kinnareemimus
 * "Kitadanisaurus" – nomen nudum; Fukuiraptor
 * "Kittysaurus" – nomen nudum; Eotyrannus
 * Klamelisaurus
 * Kol
 * Koparion
 * Koreaceratops
 * Koreanosaurus Huh et al., 2011
 * "Koreanosaurus" Kim, 1979 – nomen nudum; name later used formally for a genus of ornithopod
 * "Koreasaurus" – nomen nudum; probably an alternate spelling of "Koreanosaurus"
 * Kosmoceratops
 * Kotasaurus
 * Koutalisaurus
 * Kritosaurus
 * Kryptops
 * Krzyzanowskisaurus – probably a pseudosuchian (?Revueltosaurus)
 * Kukufeldia
 * Kulceratops
 * Kulindadromeus
 * Kulindapteryx
 * Kundurosaurus
 * Kunmingosaurus – may be a nomen nudum
 * Kuszholia – probably a bird

L

 * Labocania
 * Labrosaurus – junior synonym of Allosaurus
 * "Laelaps" – preoccupied name, now known as Dryptosaurus
 * Laevisuchus
 * Lagerpeton – actually a non-dinosaurian dinosauromorph
 * Lagosuchus – actually a non-dinosaurian dinosauromorph
 * Lamaceratops
 * Lambeosaurus
 * Lametasaurus
 * Lamplughsaura
 * Lanasaurus
 * "Lancangjiangosaurus" – variant spelling of "Lancanjiangosaurus"
 * "Lancangosaurus" – variant spelling of "Lancanjiangosaurus"
 * "Lancanjiangosaurus" – nomen nudum
 * Lanzhousaurus
 * Laornis – actually a bird
 * Laosaurus
 * Lapampasaurus
 * Laplatasaurus
 * Lapparentosaurus
 * Laquintasaura
 * Latirhinus
 * Leaellynasaura
 * Leinkupal
 * Leipsanosaurus – junior synonym of Struthiosaurus
 * "Lengosaurus" – nomen nudum; Eotyrannus
 * Leonerasaurus
 * Leptoceratops
 * Leptorhynchos
 * Leptospondylus – junior synonym of Massospondylus
 * Leshansaurus
 * Lesothosaurus
 * Lessemsaurus
 * Levnesovia
 * Lewisuchus – actually a non-dinosaurian dinosauromorph
 * Lexovisaurus
 * Leyesaurus
 * Liaoceratops
 * Liaoningosaurus
 * Libycosaurus – actually an anthracothere mammal
 * Ligabueino
 * Ligabuesaurus
 * "Ligomasaurus" – nomen nudum, probably Giraffatitan
 * "Likhoelesaurus" – nomen nudum; possibly non-dinosaurian
 * Liliensternus
 * Limaysaurus
 * "Limnornis" – preoccupied name, now known as Palaeocursornis (actually a pterosaur)
 * "Limnosaurus" – preoccupied name, now known as Telmatosaurus
 * Limusaurus
 * Linhenykus
 * Linheraptor
 * Linhevenator
 * Lirainosaurus
 * Lisboasaurus – actually a crocodilian
 * Liubangosaurus
 * Loncosaurus
 * Longisquama – actually some sort of non-dinosaurian reptile
 * Longosaurus – junior synonym of Coelophysis
 * Lophorhothon
 * Lophostropheus
 * Loricatosaurus
 * Loricosaurus
 * Losillasaurus


 * Lourinhanosaurus
 * Lourinhasaurus
 * Luanchuanraptor
 * "Luanpingosaurus" – nomen nudum; Psittacosaurus
 * Lucianosaurus – actually a non-dinosaurian archosauriform
 * Lufengosaurus
 * Lukousaurus
 * Luoyanggia
 * Lurdusaurus
 * Lusitanosaurus
 * Lusotitan
 * Lycorhinus
 * Lythronax

M

 * Macelognathus – actually a sphenosuchian crocodilian
 * Machairasaurus
 * Macrodontophion - actually a member of Lophotrocozoa
 * Macrogryphosaurus
 * Macrophalangia – junior synonym of Chirostenotes
 * "Macroscelosaurus" – nomen nudum; probable junior synonym of Tanystropheus
 * Macrurosaurus
 * "Madsenius" – nomen nudum
 * Magnapaulia
 * Magnirostris
 * Magnosaurus
 * "Magulodon" – nomen nudum
 * Magyarosaurus
 * Mahakala
 * Maiasaura
 * Majungasaurus
 * Majungatholus – probable junior synonym of Majungasaurus
 * Malarguesaurus
 * Malawisaurus
 * Maleevosaurus – junior synonym of Tarbosaurus
 * Maleevus
 * Mamenchisaurus
 * Manidens
 * Mandschurosaurus
 * Manospondylus – synonym of Tyrannosaurus
 * Mantellisaurus
 * Mantellodon
 * Mapusaurus
 * Marasuchus – actually a non-dinosaurian dinosauromorph
 * Marisaurus
 * Marmarospondylus
 * Marshosaurus
 * Martharaptor
 * Masiakasaurus
 * Massospondylus
 * Maxakalisaurus
 * Medusaceratops
 * "Megacervixosaurus" – nomen nudum
 * "Megadactylus" – preoccupied name, now known as Anchisaurus
 * "Megadontosaurus" – nomen nudum; Microvenator
 * Megalosaurus
 * Megapnosaurus
 * Megaraptor
 * Mei
 * Melanorosaurus
 * Mendozasaurus
 * Mercuriceratops
 * Metriacanthosaurus
 * "Microcephale" – nomen nudum
 * "Microceratops" – preoccupied name, now known as Microceratus
 * Microceratus
 * Microcoelus
 * "Microdontosaurus" – nomen nudum
 * Microhadrosaurus
 * Micropachycephalosaurus
 * Microraptor
 * Microsaurops – junior synonym of Saltasaurus
 * Microvenator
 * "Mifunesaurus" – nomen nudum
 * Minmi
 * Minotaurasaurus
 * Miragaia
 * Mirischia
 * "Moabosaurus" – nomen nudum
 * Mochlodon
 * "Mohammadisaurus" – nomen nudum; Tornieria
 * Mojoceratops
 * Mongolosaurus
 * Monkonosaurus
 * Monoclonius
 * Monolophosaurus
 * "Mononychus" – preoccupied name, now known as Mononykus
 * Mononykus
 * Montanoceratops
 * Morinosaurus
 * Morosaurus – junior synonym of Camarasaurus
 * "Moshisaurus" – nomen nudum; ?Mamenchisaurus
 * "Mtapaiasaurus" – nomen nudum, probably Giraffatitan
 * "Mtotosaurus" – nomen nudum; Dicraeosaurus
 * Mussaurus
 * Muttaburrasaurus
 * Muyelensaurus
 * Mymoorapelta

N

 * Naashoibitosaurus
 * Nambalia
 * Nankangia
 * Nanningosaurus
 * Nanosaurus
 * Nanotyrannus – possibly a juvenile Tyrannosaurus or other tyrannosaurid
 * Nanshiungosaurus
 * Nanuqsaurus
 * Nanyangosaurus
 * Narambuenatitan
 * Nasutoceratops
 * Nebulasaurus
 * "Nectosaurus" – preoccupied name, now known as Kritosaurus
 * Nedcolbertia
 * Nedoceratops
 * Neimongosaurus
 * "Nemegtia" – preoccupied name, now known as Nemegtomaia
 * Nemegtomaia
 * Nemegtosaurus
 * "Neosaurus" – preoccupied name, now known as Parrosaurus (possible junior synonym of Hypsibema)
 * Neosodon
 * Neovenator
 * Neuquenraptor
 * Neuquensaurus
 * "Newtonsaurus" – nomen nudum
 * "Ngexisaurus" – nomen nudum
 * Nigersaurus
 * Ningyuansaurus
 * Niobrarasaurus
 * Nipponosaurus
 * Noasaurus
 * Nodocephalosaurus
 * Nodosaurus
 * Nomingia
 * Nopcsaspondylus
 * Normanniasaurus
 * Nothronychus
 * Notoceratops
 * Notohypsilophodon
 * Nqwebasaurus
 * "Nteregosaurus" – nomen nudum; Janenschia
 * "Nurosaurus" – nomen nudum
 * Nuthetes
 * Nyasasaurus – possibly a non-dinosaurian dinosauriform
 * "Nyororosaurus" – nomen nudum; Dicraeosaurus

O

 * Ohmdenosaurus
 * Ojoceratops
 * Ojoraptorsaurus
 * Oligosaurus – junior synonym of Rhabdodon
 * Olorotitan
 * Omeisaurus
 * Omnivoropteryx - probably a bird
 * "Omosaurus" – preoccupied name, now known as Dacentrurus
 * Onychosaurus – synonym of Rhabdodon, or a dubious ankylosaurian
 * Oohkotokia
 * Opisthocoelicaudia
 * Oplosaurus
 * "Orcomimus" – nomen nudum
 * Orinosaurus – junior synonym (unneeded replacement name) of Orosaurus
 * Orkoraptor
 * Ornatotholus
 * Ornithodesmus
 * "Ornithoides" – nomen nudum; Saurornithoides
 * Ornitholestes
 * Ornithomerus – junior synonym of Rhabdodon
 * Ornithomimoides
 * Ornithomimus
 * Ornithopsis
 * Ornithosuchus – actually a non-dinosaurian archosaur
 * Ornithotarsus – possible junior synonym of Hadrosaurus
 * Orodromeus
 * Orosaurus – possible junior synonym of Euskelosaurus
 * Orthogoniosaurus
 * Orthomerus
 * Oryctodromeus
 * "Oshanosaurus" – nomen nudum
 * Osmakasaurus
 * Ostafrikasaurus
 * Othnielia
 * Othnielosaurus
 * "Otogosaurus" – nomen nudum
 * Ouranosaurus
 * Overosaurus
 * Oviraptor
 * "Ovoraptor" – nomen nudum; Velociraptor
 * Owenodon
 * Oxalaia
 * Ozraptor

P

 * Pachycephalosaurus
 * Pachyrhinosaurus
 * Pachysauriscus – probable junior synonym of Plateosaurus
 * Pachysaurops – probable junior synonym of Plateosaurus
 * "Pachysaurus" – preoccupied name, now known as Pachysauriscus; probable junior synonym of Plateosaurus
 * Pachyspondylus – probable junior synonym of Massospondylus
 * Pachysuchus
 * Pakisaurus
 * Palaeoctonus – actually a phytosaur
 * Palaeocursornis – actually an azhdarchoid pterosaur
 * "Palaeolimnornis" – nomen nudum; Palaeocursornis, pterodactyloid pterosaur belonging to Azhdarchoidea
 * Palaeopteryx – possibly a bird
 * Palaeosauriscus – junior synonym of Paleosaurus
 * "Palaeosaurus" Riley & Stutchbury, 1836 – preoccupied name, now known as Paleosaurus
 * "Palaeosaurus" Fitzinger, 1840 – preoccupied name, now known as Sphenosaurus, a non-dinosaurian procolophonid
 * Palaeoscincus
 * Paleosaurus – actually a non-dinosaurian archosaur
 * Paludititan
 * Paluxysaurus
 * Pampadromaeus
 * Pamparaptor
 * Panamericansaurus
 * Panguraptor
 * Panoplosaurus
 * Panphagia
 * Pantydraco
 * "Paraiguanodon" – nomen nudum; Bactrosaurus
 * Paralititan
 * Paranthodon
 * Pararhabdodon
 * Parasaurolophus
 * Pareiasaurus – actually a pareiasaur
 * Parksosaurus
 * Paronychodon
 * Parrosaurus – possible junior synonym of Hypsibema
 * Parvicursor
 * Patagonykus
 * Patagosaurus
 * Pawpawsaurus
 * Pectinodon
 * Pedopenna
 * Pegomastax
 * Peishansaurus
 * Pekinosaurus – actually a pseudosuchian; possibly a junior synonym of Revueltosaurus
 * Pelecanimimus
 * Pellegrinisaurus
 * Peloroplites
 * Pelorosaurus
 * "Peltosaurus" – preoccupied name, now known as Sauropelta
 * Penelopognathus
 * Pentaceratops
 * Petrobrasaurus
 * Phaedrolosaurus
 * Philovenator
 * Phuwiangosaurus
 * Phyllodon
 * Piatnitzkysaurus
 * Picrodon – junior synonym of Avalonianus
 * Pinacosaurus
 * Pisanosaurus
 * Pitekunsaurus
 * Piveteausaurus
 * Planicoxa
 * Plateosauravus
 * Plateosaurus
 * Platyceratops
 * Pleurocoelus – possibly Astrodon
 * Pleuropeltus – junior synonym of Struthiosaurus
 * Pneumatoarthrus – actually a turtle
 * Pneumatoraptor
 * Podokesaurus
 * Poekilopleuron
 * Polacanthoides – junior synonym of Hylaeosaurus
 * Polacanthus
 * Polyodontosaurus – junior synonym of Troodon
 * Polyonax
 * Ponerosteus
 * Poposaurus – actually a non-dinosaurian archosaur
 * Postosuchus – actually a rauisuchian
 * Pradhania
 * Prenocephale
 * Prenoceratops
 * Priconodon
 * Priodontognathus
 * Proa
 * Probactrosaurus
 * Proceratops – junior synonym (unneeded replacement name) of Ceratops
 * Proceratosaurus
 * Procerosaurus von Huene, 1902 – actually a prolacertiform archosauromorph
 * "Procerosaurus" Fritsch, 1905 – preoccupied name, now known as Ponerosteus
 * Procheneosaurus – junior synonym of Lambeosaurus
 * Procompsognathus
 * Prodeinodon
 * "Proiguanodon" – nomen nudum; Iguanodon
 * Propanoplosaurus
 * Proplanicoxa
 * Prosaurolophus
 * Protarchaeopteryx
 * Protecovasaurus – actually a non-dinosaurian archosauriform
 * Protiguanodon – junior synonym of Psittacosaurus
 * Protoavis – described as a bird, probably a chimera including theropod dinosaur bones
 * Protoceratops
 * Protognathosaurus
 * "Protognathus" – preoccupied name, now known as Protognathosaurus
 * Protohadros
 * Protorosaurus von Meyer, 1830 – actually a non-dinosaurian reptile
 * "Protorosaurus" Lambe, 1914 – preoccupied name, now known as Chasmosaurus
 * "Protrachodon" – nomen nudum; Orthomerus
 * "Proyandusaurus" – nomen nudum; Hexinlusaurus.
 * Pseudolagosuchus – actually a non-dinosaurian dinosauromorph
 * Psittacosaurus
 * Pteropelyx
 * Pterospondylus
 * Puertasaurus
 * Pukyongosaurus
 * Pycnonemosaurus
 * Pyroraptor

Q

 * Qantassaurus
 * Qianzhousaurus
 * Qiaowanlong
 * Qinlingosaurus
 * Qingxiusaurus
 * Qiupalong
 * Quaesitosaurus
 * Quetecsaurus
 * Quilmesaurus

R

 * Rachitrema – a chimera primarily based on ichthyosaur fossils
 * Rahiolisaurus
 * "Rahona" – preoccupied name, now known as Rahonavis
 * Rahonavis – possibly a bird
 * Rajasaurus
 * Rapator
 * Rapetosaurus
 * Raptorex
 * Ratchasimasaurus
 * Rayososaurus
 * Razanandrongobe – may be a theropod or crocodylomorph
 * Rebbachisaurus
 * Regnosaurus
 * Revueltosaurus – actually a pseudosuchian
 * Rhabdodon
 * Rhadinosaurus – may be non-dinosaurian, possibly crocodilian
 * Rhinorex
 * Rhodanosaurus – junior synonym of Struthiosaurus
 * Rhoetosaurus
 * Rhopalodon – actually a synapsid
 * Richardoestesia
 * "Rileya" – preoccupied name, now known as Rileyasuchus
 * Rileyasuchus – actually a phytosaur
 * Rinchenia
 * Rinconsaurus
 * Rioarribasaurus – junior synonym of Coelophysis
 * "Riodevasaurus" - nomen nudum; Turiasaurus
 * Riojasaurus
 * Riojasuchus – actually a non-dinosaurian archosaur
 * Rocasaurus
 * "Roccosaurus" – nomen nudum; Melanorosaurus
 * Rubeosaurus
 * Ruehleia
 * Rugops
 * Rukwatitan
 * Ruyangosaurus

S

 * Sacisaurus – actually a silesaurid
 * Sahaliyania
 * Saichania
 * "Salimosaurus" – nomen nudum, probably Giraffatitan
 * Saltasaurus
 * Saltopus – probably a non-dinosaurian dinosauromorph
 * "Saltriosaurus" – nomen nudum
 * "Sanchusaurus" – nomen nudum
 * "Sangonghesaurus" – nomen nudum
 * Sanjuansaurus
 * Sanpasaurus
 * Santanaraptor
 * Sarahsaurus
 * Sarcolestes
 * Sarcosaurus
 * Saturnalia
 * Sauraechinodon – junior synonym of Echinodon
 * Saurolophus
 * Sauroniops
 * Sauropelta
 * Saurophaganax
 * "Saurophagus" – preoccupied name, now known as Saurophaganax
 * Sauroplites
 * "Sauropodus" – nomen nudum
 * Sauroposeidon
 * Saurornithoides
 * Saurornitholestes
 * Scansoriopteryx – possible junior synonym of Epidendrosaurus
 * Scaphonyx – actually a rhynchosaur
 * Scelidosaurus
 * Scipionyx
 * Sciurumimus
 * Scleromochlus – actually a non-dinosaurian avemetatarsalian
 * Scolosaurus
 * "Scrotum" – invalid, considered to have been a descriptive label rather than a Linnaean name
 * Scutellosaurus
 * Secernosaurus
 * Segisaurus
 * Segnosaurus
 * Seismosaurus – junior synonym of Diplodocus
 * Seitaad
 * "Selimanosaurus" – nomen nudum; Dicraeosaurus
 * Sellacoxa
 * Sellosaurus – likely junior synonym of Plateosaurus
 * Serendipaceratops
 * Shamosaurus
 * Shanag
 * Shanshanosaurus – junior synonym of Tarbosaurus
 * Shantungosaurus
 * Shanxia
 * Shanyangosaurus
 * Shaochilong
 * Shenzhouraptor – actually a bird; likely junior synonym of Jeholornis.
 * Shenzhousaurus
 * Shidaisaurus
 * Shixinggia
 * Shuangmiaosaurus
 * Shunosaurus
 * Shuosaurus – misspelling of Shunosaurus
 * Shuvosaurus – actually a rauisuchian
 * Shuvuuia
 * Siamodon
 * Siamosaurus
 * Siamotyrannus
 * Siats
 * Sigilmassasaurus
 * Silesaurus – actually a silesaurid
 * Siluosaurus
 * Silvisaurus
 * Similicaudipteryx
 * Sinocalliopteryx
 * Sinoceratops
 * Sinocoelurus
 * "Sinopliosaurus" – material originally classified with pliosaur Sinopliosaurus, now recognized as dinosaurian
 * Sinornithoides
 * Sinornithomimus
 * Sinornithosaurus
 * Sinosauropteryx
 * Sinosaurus
 * Sinotyrannus
 * Sinovenator
 * Sinraptor
 * Sinusonasus
 * Skorpiovenator
 * "Smilodon" – preoccupied name, now known as Zanclodon
 * Sonidosaurus
 * Sonorasaurus
 * Sphaerotholus
 * Sphenosaurus – actually a non-dinosaurian reptile
 * Sphenospondylus
 * Spinophorosaurus
 * Spinops
 * Spinosaurus
 * Spinostropheus
 * Spinosuchus – actually a non-dinosaurian reptile
 * Spondylosoma – possibly a rauisuchian
 * Squalodon – actually a cetacean
 * Staurikosaurus
 * Stegoceras
 * Stegopelta
 * Stegosaurides
 * Stegosaurus
 * Stenonychosaurus – junior synonym of Troodon
 * Stenopelix
 * Stenotholus – junior synonym of Stygimoloch
 * Stephanosaurus – junior synonym of Lambeosaurus
 * "Stereocephalus" – preoccupied name, now known as Euoplocephalus
 * "Stereosaurus" – nomen nudum; possibly a plesiosaur
 * Sterrholophus – junior synonym of Triceratops
 * Stokesosaurus
 * Stormbergia
 * Strenusaurus – junior synonym of Riojasaurus
 * Streptospondylus
 * Struthiomimus
 * Struthiosaurus
 * Stygimoloch – possibly a sub-adult Pachycephalosaurus
 * Stygivenator – junior synonym of Tyrannosaurus
 * Styracosaurus
 * Succinodon – actually fossilized mollusc borings
 * Suchomimus
 * Suchosaurus – originally described as a crocodile, actually a spinosaurid
 * Suchoprion – actually a phytosaur
 * "Sugiyamasaurus" – nomen nudum
 * Sulaimanisaurus
 * Supersaurus
 * Suuwassea
 * Suzhousaurus
 * Symphyrophus – junior synonym of Camptosaurus
 * Syngonosaurus
 * "Syntarsus" – preoccupied name, now known as Megapnosaurus
 * Syrmosaurus – junior synonym of Pinacosaurus
 * Szechuanosaurus

T

 * Tachiraptor
 * Talarurus
 * Talenkauen
 * Talos
 * Tambatitanis
 * Tangvayosaurus
 * Tanius
 * Tanycolagreus
 * Tanystropheus – actually a prolacertiform archosauromorph
 * Tanystrosuchus – possible junior synonym of Halticosaurus or Liliensternus
 * Taohelong
 * Tapinocephalus – actually a therapsid
 * Tapuiasaurus
 * Tarascosaurus
 * Tarbosaurus
 * Tarchia
 * Tastavinsaurus
 * Tatankacephalus
 * Tatankaceratops
 * Tataouinea
 * Tatisaurus
 * Taveirosaurus
 * Tawa
 * Tawasaurus
 * Tazoudasaurus
 * Technosaurus – actually a silesaurid
 * Tecovasaurus – actually a non-dinosaurian archosauriform
 * Tehuelchesaurus
 * Teinurosaurus
 * "Teleocrater" – nomen nudum; possibly non-dinosaurian
 * Telmatosaurus
 * "Tenantosaurus" – nomen nudum; Tenontosaurus
 * "Tenchisaurus" – nomen nudum; actually an unpublished museum name for Tianchisaurus
 * Tendaguria
 * Tenontosaurus
 * Teratophoneus
 * Teratosaurus – actually a non-dinosaurian archosaur
 * Termatosaurus – actually a phytosaur
 * Tethyshadros
 * Tetragonosaurus – junior synonym of Lambeosaurus
 * Texacephale
 * Texasetes
 * Teyuwasu
 * Thecocoelurus
 * Thecodontosaurus
 * Thecospondylus
 * Theiophytalia
 * Therizinosaurus
 * Therosaurus – junior synonym of Iguanodon
 * Thescelosaurus
 * Thespesius – possibly Edmontosaurus
 * "Thotobolosaurus" – nomen nudum
 * Tianchisaurus
 * "Tianchungosaurus" – nomen nudum; Dianchungosaurus (crocodilian)
 * Tianyulong
 * Tianyuraptor
 * Tianzhenosaurus
 * Tichosteus
 * Tienshanosaurus
 * Timimus
 * Titanoceratops
 * Titanosaurus Lydekker, 1877
 * "Titanosaurus" Marsh, 1877 – preoccupied name, now known as Atlantosaurus
 * Tochisaurus
 * "Tomodon" – preoccupied name, now known as Diplotomodon
 * Tonganosaurus
 * "Tonouchisaurus" – nomen nudum
 * Torilion – junior synonym of Barilium
 * Tornieria
 * Torosaurus – possibly the mature form of Triceratops
 * Torvosaurus
 * Trachodon
 * Traukutitan
 * Trialestes – actually a crocodilian
 * "Triassolestes" – preoccupied name, now known as Trialestes
 * Tribelesodon – actually Tanystropheus, a prolacertiform archosauromorph
 * Triceratops
 * Trigonosaurus
 * Trimucrodon
 * Trinisaura
 * Troodon
 * Tsaagan
 * Tsagantegia
 * Tsintaosaurus
 * "Tsuchikurasaurus" – nomen nudum
 * Tugulusaurus
 * Tuojiangosaurus
 * Turanoceratops
 * Turiasaurus
 * Tylocephale
 * Tylosteus – synonym of Pachycephalosaurus
 * Tyrannosaurus
 * Tyrannotitan
 * "Tyreophorus" – nomen nudum, probably a typographical error for "thyreophoran"

U

 * Uberabatitan
 * Udanoceratops
 * Ugrosaurus – probably junior synonym of Triceratops
 * Uintasaurus – junior synonym of Camarasaurus
 * Ultrasauros – junior synonym of Supersaurus
 * Ultrasaurus H. M. Kim, 1983
 * "Ultrasaurus" Jensen, 1985 – preoccupied name, now known as Ultrasauros
 * Umarsaurus – nomen nudum; Barsboldia
 * Unaysaurus
 * Unenlagia
 * Unescoceratops
 * "Unicerosaurus" – nomen nudum, actually a fish
 * Unquillosaurus
 * Urbacodon
 * Utahceratops
 * Utahraptor
 * Uteodon

V

 * Vagaceratops
 * Vahiny
 * Valdoraptor
 * Valdosaurus
 * Variraptor
 * Vectensia – junior synonym of Polacanthus
 * Vectisaurus
 * Velafrons
 * Velocipes
 * Velociraptor
 * Velocisaurus
 * Venaticosuchus – actually a non-dinosaurian archosaur
 * Venenosaurus
 * Veterupristisaurus
 * Vitakridrinda
 * Vitakrisaurus
 * Volkheimeria
 * Vulcanodon

W

 * Wadhurstia – junior synonym of Hypselospinus
 * Wakinosaurus
 * Walgettosuchus
 * "Walkeria" – preoccupied name, now known as Alwalkeria
 * "Walkersaurus" – nomen nudum; Duriavenator
 * "Wangonisaurus" – nomen nudum, probably Giraffatitan
 * Wannanosaurus
 * Wellnhoferia – actually a bird, possible junior synonym of the bird Archaeopteryx
 * Willinakaqe
 * Wintonotitan
 * Wuerhosaurus
 * Wulagasaurus
 * Wulatelong
 * Wyleyia – probably a bird
 * "Wyomingraptor" – nomen nudum

X

 * Xenoceratops
 * Xenoposeidon
 * Xenotarsosaurus
 * Xianshanosaurus
 * Xiaosaurus
 * Xiaotingia
 * Xinjiangovenator
 * Xinjiangtitan
 * Xiongguanlong
 * Xixianykus
 * Xixiasaurus
 * Xixiposaurus
 * Xuanhanosaurus
 * Xuanhuaceratops
 * "Xuanhuasaurus" – nomen nudum; Xuanhuaceratops
 * Xuwulong

Y

 * Yaleosaurus – junior synonym of Anchisaurus
 * Yamaceratops
 * Yandusaurus
 * Yangchuanosaurus
 * Yanornis – actually a bird
 * Yaverlandia
 * Yaxartosaurus – misspelling of Jaxartosaurus
 * "Yezosaurus" – nomen nudum; non-dinosaurian
 * "Yibinosaurus" – nomen nudum
 * Yimenosaurus
 * "Yingshanosaurus" – nomen nudum
 * Yinlong
 * Yixianosaurus
 * "Yizhousaurus" – nomen nudum
 * Yongjinglong
 * "Yuanmouraptor" – nomen nudum
 * Yuanmousaurus
 * Yueosaurus
 * Yulong
 * Yunganglong
 * Yunnanosaurus
 * "Yunxiansaurus" – nomen nudum
 * Yutyrannus

Z

 * Zalmoxes
 * Zanabazar
 * Zanclodon – non-dinosaurian
 * Zapalasaurus
 * Zapsalis
 * Zatomus – actually a non-dinosaurian archosaur
 * Zby
 * Zephyrosaurus
 * Zhanghenglong
 * Zhejiangosaurus
 * Zhongornis
 * Zhongyuansaurus
 * Zhuchengceratops
 * Zhuchengosaurus - junior synonym of Shantungosaurus
 * Zhuchengtyrannus
 * Ziapelta
 * Zigongosaurus – possible junior synonym of Mamenchisaurus
 * Zizhongosaurus
 * Zuniceratops
 * Zuolong
 * Zupaysaurus