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How many dinosaurs were there. There are 1347 Dinosaurs Species in the world.
Millions of years ago, long before there were any people, there were dinosaurs. Dinosaurs were one of several kinds of prehistoric reptiles that lived during the Mesozoic Era, the “Age of Reptiles.”
The dinosaurs dominated the Earth for over 165 million years, but mysteriously went extinct 65 million years ago. Paleontologists study their fossil remains to learn about the amazing prehistoric world of dinosaurs.
Dinosaurs were land-dwelling reptiles that walked with an erect stance. Their unique hip structure caused their legs to stick out from under their bodies, and not sprawl out from the side (like other reptiles ). When dinosaurs first evolved from more primitive archosaurs, they were bipedal (walked on two legs). Much later, some dinosaur groups returned to a four-legged stance, having hind legs much larger than their front legs .
There were lots of different kinds of dinosaurs that lived at different times. Some were HUGE, some were small. Some walked on two legs, some walked on four . Some were speedy , and some were slow and lumbering . Some were carnivores and some were herbivores . Some were armor-plated, some had thick, bumpy skin, some had horns , some even had primitive feathers.
No one knows what colors or patterns they were, how they sounded, how they behaved, how they mated, or even how to tell whether a fossil came from a male or a female dinosaur.
Dinosaurs suddenly became extinct about 65 million years ago, at the end of the Cretaceous period, which was a time of high volcanic and tectonic activity. There are a lot of theories why the extinction occurred. The most widely accepted theory is that an asteroid impact caused major climactic changes which the dinosaurs couldn’t adapt to.
All that’s left of the dinosaurs are fossils.
Although dinosaurs’ fossils have been known since 1818, the term dinosaur (deinos = terrifying; sauros = lizard) was coined by the English anatomist Sir Richard Owen in 1842. The only three dinosaurs known at the time were Megalosaurus, Iguanodon, and Hylaeosaurus, very large dinosaurs.
- Aachenosaurus – actually a piece of petrified wood
- Aardonyx
- “Abdallahsaurus” – nomen nudum, probably Brachiosaurus or Giraffatitan
- Abelisaurus
- Abrictosaurus
- Abrosaurus
- Abydosaurus
- Acanthopholis
- Achelousaurus
- Achillesaurus
- Achillobator
- “Acracanthus” – original invalid name of Acrocanthosaurus
- Acristavus
- Acrocanthosaurus
- Actiosaurus – probably an ichthyosaur
- 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
- “Airakoraptor” – nomen nudum
- Ajkaceratops
- Alamosaurus
- “Alashansaurus” – nomen nudum; Shaochilong
- Alaskacephale
- Albalophosaurus
- Albertaceratops
- Albertonykus
- Albertosaurus
- Albinykus
- Albisaurus – a non-dinosaurian reptile
- Alectrosaurus
- Aletopelta
- Algoasaurus
- Alioramus
- Aliwalia – junior synonym of Eucnemesaurus
- 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
- Anchiceratops
- Anchiornis
- Anchisaurus
- Andesaurus
- Angaturama – probable junior synonym of Irritator
- “Angloposeidon” – nomen nudum
- Angolatitan
- Angulomastacator
- Aniksosaurus
- Animantarx
- Ankistrodon – actually a proterosuchid archosauriform
- Ankylosaurus
- Anodontosaurus – junior synonym of Euoplocephalus or Dyoplosaurus
- Anoplosaurus
- Anserimimus
- Antarctopelta
- Antarctosaurus
- Anthodon – actually a pareiasaur
- Antrodemus – possibly a junior synonym of Allosaurus
- Apatodon – possibly a junior synonym of Allosaurus
- Apatosaurus – popularly known as Brontosaurus
- Appalachiosaurus
- Aragosaurus
- Aralosaurus
- “Araucanoraptor” – nomen nudum; Neuquenraptor
- Archaeoceratops
- Archaeodontosaurus
- Archaeopteryx
- “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
- Arctosaurus – actually some sort of non-dinosaurian reptile
- Arcusaurus
- Arenysaurus
- Argentinosaurus
- Argyrosaurus
- Aristosaurus – junior synonym of Massospondylus
- Aristosuchus
- Arizonasaurus – actually a rauisuchian
- “Arkanosaurus” – variant spelling of “Arkansaurus”
- “Arkansaurus” – nomen nudum
- Arkharavia
- Arrhinoceratops
- Arstanosaurus
- Asiaceratops
- Asiamericana
- Asiatosaurus
- Astrodon
- Astrodonius – junior synonym of Astrodon
- Astrodontaurus – junior synonym of Astrodon
- Asylosaurus
- Atacamatitan
- Atlantosaurus – possible junior synonym of Apatosaurus or Camarasaurus
- Atlasaurus
- Atlascopcosaurus
- Atrociraptor
- Atsinganosaurus
- Aublysodon
- “Augustia” – preoccupied name, now known as Agustinia
- Auroraceratops
- 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
- Bactrosaurus
- Bagaceratops
- Bagaraatan
- Bahariasaurus
- Bainoceratops
- “Bakesaurus” – nomen nudum
- Balaur
- Balochisaurus
- Bambiraptor
- Banji
- Baotianmansaurus
- Barapasaurus
- Barilium
- Barosaurus
- Barsboldia
- Baryonyx
- “Bashunosaurus” – nomen nudum
- Basutodon – actually a non-dinosaurian archosaur
- Bathygnathus – actually a pelycosaur
- Baurutitan
- “Bayosaurus” – nomen nudum
- Becklespinax
- “Beelemodon” – nomen nudum
- Beipiaosaurus
- Beishanlong
- Bellusaurus
- Belodon – actually a phytosaur
- Berberosaurus
- Betasuchus
- Bienosaurus
- Bihariosaurus
- “Bilbeyhallorum” – nomen nudum; Cedarpelta
- Bissektipelta
- Bistahieversor
- “Blancocerosaurus” – nomen nudum, probably Brachiosaurus or Giraffatitan
- Blasisaurus
- Blikanasaurus
- Bolong
- Bonapartenykus
- Bonatitan
- Bonitasaura
- Borealosaurus
- Borogovia
- Bothriospondylus
- Brachiosaurus
- Brachyceratops
- Brachylophosaurus
- Brachypodosaurus
- Brachyrophus – junior synonym of Camptosaurus
- Brachytaenius – actually some sort of non-dinosaurian reptile, possibly the same as Dakosaurus
- Brachytrachelopan
- Bradycneme
- Brasileosaurus – actually a non-dinosaurian archosaur
- Breviceratops
- Brohisaurus
- Brontomerus
- “Brontoraptor” – nomen nudum
- Brontosaurus – junior synonym of Apatosaurus
- Bruhathkayosaurus
- Bugenasaura – junior synonym of Thescelosaurus
- Buitreraptor
- “Byranjaffia” – nomen nudum; Byronosaurus
- Byronosaurus
- Camarasaurus skull.Caenagnathasia
- Caenagnathus – probable junior synonym of Chirostenotes
- Calamosaurus
- Calamospondylus Fox, 1866
- “Calamospondylus” Lydekker, 1889 – preoccupied name, now known as Calamosaurus
- Callovosaurus
- Camarasaurus
- Camelotia
- Camposaurus
- “Camptonotus” – preoccupied name, now known as Camptosaurus
- Camptosaurus
- “Campylodon” – preoccupied name, now known as Campylodoniscus
- Campylodoniscus
- “Capitalsaurus” – nomen nudum
- Carcharodontosaurus
- Cardiodon
- “Carnosaurus” – nomen nudum, probably a typographical error for “carnosaur”
- Carnotaurus
- Caseosaurus
- Cathartesaura
- Cathetosaurus – junior synonym of Camarasaurus
- 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”
- Chaoyangosaurus – misspelling of Chaoyangsaurus
- 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
- Chirostenotes
- Chondrosteosaurus
- Chondrosteus – misspelling of Chondrosteosaurus
- Chromogisaurus
- Chuandongocoelurus
- Chuanjiesaurus
- 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 non-dinosaurian archosaur, except for C. fraserianus, which is part of the taxonomy of
Palaeosaurus - “Clevelanotyrannus” – nomen nudum; Nanotyrannus
- Coahuilaceratops
- Coelophysis
- “Coelosaurus” – preoccupied name, now known as Ornithomimus and Archaeornithomimus.
- 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
- “Comanchesaurus” – nomen nudum
- Compsognathus
- Compsosuchus
- Concavenator
- Conchoraptor
- Condorraptor
- 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
- “Cylindricodon” – preoccupied name, now known as Hylaeosaurus
- Cystosaurus – actually a crocodilian which through a typographical error was confused with Cryptosaurus
- Deinonychus skeleton.Daanosaurus
- Dacentrurus
- “Dachongosaurus” – nomen nudum
- “Dachungosaurus” – variant spelling of “Dachongosaurus”
- Daemonosaurus
- Dakosaurus – actually a metriorhynchid crocodilian
- Dakotadon
- “Damalasaurus” – nomen nudum
- Dandakosaurus
- Danubiosaurus – junior synonym of Struthiosaurus
- “Daptosaurus” – nomen nudum; early manuscript name for Deinonychus
- Dashanpusaurus
- Daspletosaurus
- Dasygnathoides – actually a non-dinosaurian archosaur, junior synonym of Ornithosuchus
- “Dasygnathus” – preoccupied name, now known as Dasygnathoides
- Datousaurus
- 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
- 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
- Drinker
- Dromaeosaurus
- Dromiceiomimus
- Dromicosaurus – junior synonym of Massospondylus
- Drusilasaura
- Dryosaurus
- Dryptosauroides
- Dryptosaurus
- Dubreuillosaurus
- Duriatitan
- Duriavenator
- Dynamosaurus – junior synonym of Tyrannosaurus
- Dyoplosaurus
- Dysalotosaurus – junior synonym of Dryosaurus
- Dysganus
- Dyslocosaurus
- Dystrophaeus
- Dystylosaurus – junior synonym of Supersaurus
- Echinodon
- Edmarka
- Edmontonia
- Edmontosaurus
- Efraasia
- Einiosaurus
- Ekrixinatosaurus
- Elachistosuchus – a rhynchocephalian
- Elaphrosaurus
- Elmisaurus
- Elopteryx
- Elosaurus – junior synonym of Apatosaurus
- Elrhazosaurus
- “Elvisaurus” – nomen nudum; Cryolophosaurus
- Emausaurus
- Embasaurus
- Empaterias – misspelling of Epanterias
- Enigmosaurus
- Eobrontosaurus
- Eocarcharia
- Eoceratops – junior synonym of Chasmosaurus
- Eocursor
- Eodromaeus
- “Eohadrosaurus” – nomen nudum; Eolambia
- Eolambia
- Eolosaurus – junior synonym of Aeolosaurus
- Eomamenchisaurus
- Eoraptor
- Eotriceratops
- Eotyrannus
- Epachthosaurus
- Epanterias – may be Allosaurus
- “Ephoenosaurus” – nomen nudum; Machimosaurus (a crocodilian)
- Epicampodon – actually a proterosuchid archosauriform
- Epichirostenotes
- Epidendrosaurus
- Epidexipteryx
- Equijubus
- Erectopus
- Erliansaurus
- Erlicosaurus – misspelling of Erlikosaurus
- Erlikosaurus
- Eshanosaurus
- “Euacanthus” – nomen nudum; junior synonym of Polacanthus
- Eucamerotus
- Eucentrosaurus – junior synonym (unneeded replacement name) of Centrosaurus
- Eucercosaurus – possibly Anoplosaurus
- Eucnemesaurus
- Eucoelophysis – actually a non-dinosaurian dinosauromorph
- “Eugongbusaurus” – nomen nudum
- Euhelopus
- Euoplocephalus
- Eupodosaurus – a nothosaur synonymous with Lariosaurus
- “Eureodon” – nomen nudum; Tenontosaurus
- Eurolimnornis – possibly a bird
- Euronychodon
- Europasaurus
- Euskelosaurus
- Eustreptospondylus
- Fabrosaurus – possibly Lesothosaurus
- Falcarius
- “Fenestrosaurus” – nomen nudum; Oviraptor
- Ferganasaurus
- Ferganocephale
- Frenguellisaurus – junior synonym of Herrerasaurus
- Fruitadens
- Fukuisaurus
- Fukuititan
- Fulengia
- Fulgurotherium
- “Fusinasus” – nomen nudum; Eotyrannus
- Fusuisaurus
- “Futabasaurus” – nomen nudum; not to be confused with the formally-named plesiosaur Futabasaurus
- Futalognkosaurus
- “Futalongkosaurus” – variant spelling of Futalognkosaurus
- “Gadolosaurus” – nomen nudum
- Galesaurus – actually a therapsid
- Gallimimus
- Galtonia – actually a pseudosuchian; possibly a junior synonym of Revueltosaurus
- Galveosaurus
- Galvesaurus – junior synonym of Galveosaurus
- “Gansutitan” – nomen nudum; Daxiatitan
- Gargoyleosaurus
- Garudimimus
- Gasosaurus
- Gasparinisaura
- Gastonia
- “Gavinosaurus” – nomen nudum; Eotyrannus
- Geminiraptor
- Genusaurus
- Genyodectes
- Geranosaurus
- Giganotosaurus
- Gigantoraptor
- Gigantosaurus Seeley, 1869
- “Gigantosaurus” E. Fraas, 1908 – preoccupied name, now known as Tornieria, Malawisaurus, and Janenschia
- Gigantoscelus – junior synonym of Euskelosaurus
- Gigantspinosaurus
- Gilmoreosaurus
- “Ginnareemimus” – nomen nudum; Kinnareemimus
- Giraffatitan
- Glacialisaurus
- Glishades
- Glyptodontopelta
- Gobipteryx – actually an enantiornithine bird
- Gobisaurus
- Gobititan
- “Godzillasaurus” – nomen nudum; Gojirasaurus
- Gojirasaurus
- Gondwanatitan
- Gongbusaurus
- Gongxianosaurus
- Gorgosaurus
- Goyocephale
- Graciliceratops
- Graciliraptor
- Gracilisuchus – actually a non-dinosaurian archosaur
- “Gravisaurus” – nomen nudum; Lurdusaurus
- Gravitholus
- Gresslyosaurus – junior synonym of Plateosaurus
- Griphornis – junior synonym of the bird Archaeopteryx
- Griphosaurus – junior synonym of the bird Archaeopteryx
- “Gripposaurus” – nomen nudum; “Gyposaurus” sinensis
- Gryphoceratops
- “Gryphognathus” – nomen nudum; Gryphoceratops
- Gryponyx
- Gryposaurus
- Guaibasaurus
- Guanlong
- Gwyneddosaurus – a tanystrophid
- Gyposaurus – junior synonym of Massospondylus
- “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
- Helioceratops
- “Helopus” – preoccupied name, now known as Euhelopus
- Heptasteornis
- Herbstosaurus – actually a pterosaur
- Herrerasaurus
- Hesperonychus
- Hesperosaurus
- Heterodontosaurus
- Heterosaurus – junior synonym of Iguanodon
- Hexinlusaurus
- Heyuannia
- Hierosaurus – junior synonym of Nodosaurus
- Hikanodon – junior synonym of Iguanodon
- “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
- “Huaxiasaurus” – nomen nudum; Huaxiagnathus
- Huayangosaurus
- Hudiesaurus
- Huehuecanauhtlus
- Hulsanpes – possibly a bird
- Hungarosaurus
- Hylaeosaurus
- Hylosaurus – junior synonym of Hylaeosaurus
- Hypacrosaurus
- “Hypselorhachis” – nomen nudum
- Hypselosaurus
- Hypselospinus
- Hypsibema
- Hypsilophodon
- Hypsirophus – probable junior synonym of Stegosaurus
- “Ichabodcraniosaurus” – nomen nudum; probably Velociraptor
- Ignavusaurus
- Iguanacolossus
- Iguanodon
- “Iguanoides” – nomen nudum; Iguanodon
- “Iguanosaurus” – nomen nudum; Iguanodon
- Iliosuchus
- Ilokelesia
- Incisivosaurus
- Indosuchus
- “Ingenia” – preoccupied name, has not yet been renamed
- Inosaurus
- Irritator
- Isanosaurus
- Ischisaurus – junior synonym of Herrerasaurus
- “Ischyrosaurus” – preoccupied name, has not yet been renamed
- Isisaurus
- “Issasaurus” – nomen nudum; Dicraeosaurus
- Itemirus
- Iuticosaurus
- Jainosaurus
- Jaklapallisaurus
- Janenschia
- Jaxartosaurus
- Jeholornis – actually a bird
- Jeholosaurus
- Jenghizkhan – junior synonym of Tarbosaurus
- “Jensenosaurus” – nomen nudum; Supersaurus
- Jeyawati
- “Jiangjunmiaosaurus” – nomen nudum; Monolophosaurus
- Jiangjunosaurus
- Jiangshanosaurus
- Jingshanosaurus
- Jintasaurus
- Jinzhousaurus
- Jiutaisaurus
- Jixiangornis – actually a bird
- Jobaria
- Jubbulpuria
- Jurapteryx – junior synonym of the bird Archaeopteryx
- “Jurassosaurus” – nomen nudum; Tianchisaurus
- Juratyrant
- Juravenator
- “Kagasaurus” – nomen nudum
- Kaijiangosaurus
- Kakuru
- Kangnasaurus
- Karongasaurus
- “Katsuyamasaurus” – nomen nudum
- Kayentavenator
- Kelmayisaurus
- Kemkemia
- Kentrosaurus
- Kerberosaurus
- Khaan
- “Khateranisaurus” – misspelling of “Khetranisaurus”
- 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
- Kunmingosaurus – may be a nomen nudum
- Kuszholia – probably a bird
- 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
- Laplatasaurus
- Lapparentosaurus
- Leaellynasaura
- Leipsanosaurus – junior synonym of Struthiosaurus
- “Lengosaurus” – nomen nudum; Eotyrannus
- Leonerasaurus
- Leptoceratops
- Leptospondylus – junior synonym of Massospondylus
- Leshansaurus
- Lesothosaurus
- Lessemsaurus
- Levnesovia
- Lewisuchus – actually a non-dinosaurian dinosauromorph
- Lexovisaurus
- Liaoceratops
- Liaoningosaurus
- “Liassaurus” – nomen nudum
- Libycosaurus – actually an anthracothere mammal
- Ligabueino
- Ligabuesaurus
- “Ligomasaurus” – nomen nudum, probably Brachiosaurus or Giraffatitan
- “Likhoelesaurus” – nomen nudum; possibly non-dinosaurian
- Liliensternus
- Limaysaurus
- “Limnornis” – preoccupied name, now known as the birds Eurolimnornis and Palaeocursornis
- “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 – possible junior synonym of Neuquensaurus
- Losillasaurus
- Lourinhanosaurus
- Lourinhasaurus
- Luanchuanraptor
- “Luanpingosaurus” – nomen nudum; Psittacosaurus
- Lucianosaurus – actually a non-dinosaurian archosauriform
- Lufengocephalus – junior synonym of Lufengosaurus
- Lufengosaurus
- Lukousaurus
- Luoyanggia
- Lurdusaurus
- Lusitanosaurus
- Lusotitan
- Lycorhinus
- Macelognathus – actually a sphenosuchian crocodilian
- Machairasaurus
- Macrodontophion
- Macrogryphosaurus
- Macrophalangia – junior synonym of Chirostenotes
- “Macroscelosaurus” – nomen nudum; probable junior synonym of Tanystropheus
- Macrurosaurus
- “Madsenius” – nomen nudum
- Magnirostris
- Magnosaurus
- “Magulodon” – nomen nudum
- Magyarosaurus
- Mahakala
- Maiasaura
- Majungasaurus
- Majungatholus – probable junior synonym of Majungasaurus
- Malarguesaurus
- Malawisaurus
- Maleevosaurus – junior synonym of Tarbosaurus
- Maleevus
- “Manidens” – nomen nudum
- Mandschurosaurus
- Manospondylus – synonym of Tyrannosaurus
- Mantellisaurus
- Mapusaurus
- Marasuchus – actually a non-dinosaurian dinosauromorph
- Marisaurus
- Marmarospondylus – probable junior synonym of Bothriospondylus
- Marshosaurus
- Masiakasaurus
- Massospondylus
- Maxakalisaurus
- Medusaceratops
- “Megacervixosaurus” – nomen nudum
- “Megadactylus” – preoccupied name, now known as Anchisaurus
- “Megadontosaurus” – nomen nudum; Microvenator
- Megalosaurus
- Megapnosaurus
- Megaraptor
- Mei
- Melanorosaurus
- Mendozasaurus
- “Merosaurus” – nomen nudum
- Metriacanthosaurus
- “Microcephale” – nomen nudum
- “Microceratops” – preoccupied name, now known as Microceratus
- Microceratus
- Microcoelus – junior synonym of Saltasaurus
- “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
- 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 Brachiosaurus or Giraffatitan
- “Mtotosaurus” – nomen nudum; Dicraeosaurus
- Mussaurus
- Muttaburrasaurus
- Muyelensaurus
- Mymoorapelta
- Naashoibitosaurus
- Nambalia
- Nanningosaurus
- Nanosaurus
- Nanotyrannosaurus – a misspelling of Nanotyrannus
- Nanotyrannus – possibly a juvenile Tyrannosaurus or other tyrannosaurid
- Nanshiungosaurus
- Nanyangosaurus
- Narambuenatitan
- “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
- “Ninghsiasaurus” – nomen nudum; Pinacosaurus
- Niobrarasaurus
- Nipponosaurus
- Noasaurus
- Nodocephalosaurus
- Nodosaurus
- Nomingia
- Nothronychus
- Notoceratops
- Notohypsilophodon
- “Nouerosaurus” – variant spelling of Nurosaurus
- Nqwebasaurus
- “Nteregosaurus” – nomen nudum; Janenschia
- “Nuoerosaurus” – variant spelling of Nurosaurus
- “Nuoersaurus” – variant spelling of Nurosaurus
- “Nurosaurus” – nomen nudum
- Nuthetes
- “Nyasasaurus” – nomen nudum; possibly non-dinosaurian
- “Nyororosaurus” – nomen nudum; Dicraeosaurus
- 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
- Opisthocoelicaudia
- Oplosaurus
- “Orcomimus” – nomen nudum
- Orinosaurus – junior synonym (unneeded replacement name) of Orosaurus
- Orkoraptor
- Ornatotholus
- Ornithodesmus
- “Ornithoides” – nomen nudum; Saurornithoides
- Ornitholestes
- 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
- Othnielia
- Othnielosaurus
- “Otogosaurus” – nomen nudum
- Ouranosaurus
- Oviraptor
- “Ovoraptor” – nomen nudum; Velociraptor
- Owenodon
- Oxalaia
- Ozraptor
- 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
- Pakisaurus
- Palaeoctonus – actually a phytosaur
- Palaeocursornis – possibly a bird
- “Palaeolimnornis” – nomen nudum; Palaeocursornis, probable bird
- 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
- Panoplosaurus
- Panphagia
- Pantydraco
- Paralititan
- Paranthodon
- Pararhabdodon
- Parasaurolophus
- Pareiasaurus – actually a pareiasaur
- “Parhabdodon” – nomen nudum; misspelling of Pararhabdodon
- Parksosaurus
- Paronychodon
- Parrosaurus – possible junior synonym of Hypsibema
- Parvicursor
- Patagonykus
- Patagosaurus
- “Patricosaurus” – actually a chimera of various non-dinosaurian reptiles
- Pawpawsaurus
- Pectinodon – junior synonym of Troodon
- Pedopenna
- 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
- 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
- Pradhania
- Prenocephale
- Prenoceratops
- Priconodon
- Priodontognathus
- 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
- Qantassaurus skeleton.Qantassaurus
- Qiaowanlong
- Qinlingosaurus
- Qingxiusaurus
- Qiupalong
- Quaesitosaurus
- Quilmesaurus
- Rachitrema – possibly an ichthyosaur
- 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
- “Revueltoraptor” – nomen nudum; junior synonym of Gojirasaurus
- Revueltosaurus – actually a pseudosuchian
- Rhabdodon
- Rhadinosaurus – may be non-dinosaurian, possibly crocodilian
- Rhodanosaurus – junior synonym of Struthiosaurus
- Rhoetosaurus
- Rhopalodon – actually a synapsid
- Ricardoestesia – intended but unofficial spelling of Richardoestesia
- Richardoestesia
- Rileyasuchus – a chimera of phytosaur and Thecodontosaurus remains
- Rinchenia
- Rinconsaurus
- Rioarribasaurus – junior synonym of Coelophysis
- Riojasaurus
- Riojasuchus – actually a non-dinosaurian archosaur
- Rocasaurus
- “Roccosaurus” – nomen nudum; Melanorosaurus
- Rubeosaurus
- Ruehleia
- Rugops
- “Rutellum” – pre-Linnaean name, invalid under modern taxonomic systems
- Ruyangosaurus
- Sacisaurus – probably a dinosauromorph
- Sahaliyania
- Saichania
- “Salimosaurus” – nomen nudum, probably Brachiosaurus or Giraffatitan
- Saltasaurus
- Saltopus – probably a dinosauromorph
- “Saltriosaurus” – nomen nudum
- “Sanchusaurus” – nomen nudum
- “Sangonghesaurus” – nomen nudum
- Sanjuansaurus
- Sanpasaurus
- Santanaraptor
- Sarahsaurus
- Sarcolestes
- Sarcosaurus
- Saturnalia
- Sauraechinodon – junior synonym of Echinodon
- “Sauraechmodon” – nomen nudum; Echinodon
- Saurolophus
- 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
- Scleromochlus – actually a non-dinosaurian avemetatarsalian
- Scolosaurus – junior synonym of Euoplocephalus
- “Scrotum” – invalid, considered to have been a descriptive label rather than a Linnaean name
- Scutellosaurus
- 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
- Sigilmassasaurus
- Silesaurus – probably a dinosauromorph
- 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
- Sinucerasaurus – junior synonym of Sinusonasus
- Sinusonasus
- “Smilodon” – preoccupied name, now known as Zanclodon
- Sonidosaurus
- Sonorasaurus
- Sphaerotholus
- Sphenosaurus – actually a non-dinosaurian reptile
- Sphenospondylus – junior synonym of Iguanodon
- Spinophorosaurus
- Spinops
- Spinosaurus
- Spinostropheus
- Spinosuchus – actually a non-dinosaurian reptile
- Spondylosoma – possibly a rauisuchian
- Squalodon – actually a cetacean
- Staurikosaurus
- Stegoceras
- Stegopelta
- Stegosaurides
- “Stegosauroides” – misspelling of 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, possibly a spinosaurid
- Suchoprion – actually a phytosaur
- “Sugiyamasaurus” – nomen nudum
- “Sulaimansaurus” – misspelling of “Sulaimanisaurus”
- Supersaurus
- Suuwassea
- Suzhousaurus
- Symphyrophus – junior synonym of Camptosaurus
- Syngonosaurus – junior synonym of Acanthopholis
- “Syntarsus” – preoccupied name, now known as Megapnosaurus
- Syrmosaurus – junior synonym of Pinacosaurus
- “Szechuanoraptor” – nomen nudum
- Szechuanosaurus
- Talarurus
- Talenkauen
- Talos
- Tangvayosaurus
- Tanius
- Tanycolagreus
- Tanystropheus – actually a prolacertiform archosauromorph
- Tanystrosuchus – possible junior synonym of Halticosaurus or Liliensternus
- Tapinocephalus – actually a therapsid
- Tapuiasaurus
- Tarascosaurus
- Tarbosaurus
- Tarchia
- Tastavinsaurus
- Tatankacephalus
- Tatankaceratops
- Tatisaurus
- Taveirosaurus
- Tawa
- Tawasaurus – junior synonym of Lufengosaurus
- Tazoudasaurus
- Technosaurus – possibly a dinosauromorph
- 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, with some Internet sources accidentally transposing species of
Tetragonosaurus onto it - Tethyshadros
- Tetragonosaurus – junior synonym of Lambeosaurus
- 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
- 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”
- 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
- Vagaceratops
- Valdoraptor
- Valdosaurus
- Variraptor
- Vectisaurus – junior synonym of Iguanodon
- Velafrons
- Velocipes
- Velociraptor
- Velocisaurus
- Venaticosuchus – actually a non-dinosaurian archosaur
- Venenosaurus
- Veterupristisaurus
- Vitakridrinda
- “Vitaridrinda” – misspelling of Vitakridrinda
- Volkheimeria
- Vulcanodon
- Wadhurstia – junior synonym of Hypselospinus
- Wakinosaurus
- Walgettosuchus
- “Walkeria” – preoccupied name, now known as Alwalkeria
- “Walkersaurus” – nomen nudum; Duriavenator
- Wannanosaurus
- Wellnhoferia – possible junior synonym of Archaeopteryx
- Willinakaqe
- Wintonotitan
- Wuerhosaurus
- Wulagasaurus
- Wyleyia – probably a bird
- “Wyomingraptor” – nomen nudum
- Xenoposeidon
- Xenotarsosaurus
- Xianshanosaurus
- Xiaosaurus
- Xinjiangovenator
- Xiongguanlong
- Xixianykus
- Xixiasaurus
- Xixiposaurus
- Xuanhanosaurus
- Xuanhuaceratops
- “Xuanhuasaurus” – nomen nudum; Xuanhuaceratops
- Xuwulong
- Yaleosaurus – junior synonym of Anchisaurus
- Yamaceratops
- Yandusaurus
- Yangchuanosaurus
- Yanornis – actually a bird
- Yaxartosaurus – misspelling of Jaxartosaurus
- “Yezosaurus” – nomen nudum; non-dinosaurian
- “Yibinosaurus” – nomen nudum
- Yimenosaurus
- “Yingshanosaurus” – nomen nudum
- Yinlong
- Yixianosaurus
- “Yizhousaurus” – nomen nudum
- Yuanmousaurus
- “Yubasaurus” – nomen nudum; Yandusaurus
- Yueosaurus
- Yunnanosaurus
- “Yunxiansaurus” – nomen nudum
- Zalmoxes
- Zanabazar
- Zanclodon – non-dinosaurian (in part), some species referred to Megalosaurus and Plateosaurus
- Zapalasaurus
- Zapsalis – junior synonym of Paronychodon
- Zatomus – actually a non-dinosaurian archosaur
- Zephyrosaurus
- Zhongyuansaurus
- Zhuchengceratops
- Zhuchengosaurus – junior synonym of Shantungosaurus
- Zhuchengtyrannus
- Zigongosaurus – possible junior synonym of Mamenchisaurus
- Zizhongosaurus
- Zuniceratops
- Zuolong
- Zupaysaurus
