page_title: List of dinosaurs
section_title: A
hierarchical_section_title: List of dinosaurs / A
caption_attribution_description: Archaeoceratops oshimai, a ceratopsian from the Early Cretaceous of China, pencil drawing, digital coloring
context_page_description: The following is a list of dinosaurs. Some of them, such as Archaeopteryx, are considered to be birds. Some doubtful Mesozoic birds are included in this list.
context_section_description: Aachenosaurus – a piece of petrified wood
  Aardonyx
  Abdallahsaurus – nomen nudum, probably Giraffatitan
  Abelisaurus
  Abrictosaurus
  Abrosaurus
  Abydosaurus
  Acantholipan
  Acanthopholis
  Achelousaurus
  Acheroraptor
  Achillesaurus
  Achillobator
  Acristavus
  Acrocanthosaurus
  Acrotholus
  Actiosaurus – a choristoderan
  Adamantisaurus
  Adasaurus
  Adelolophus
  Adeopapposaurus
  Adynomosaurus
  Aegyptosaurus
  Aeolosaurus
  Aepisaurus
  Aepyornithomimus
  Aerosteon
  Aetonyx – possible junior synonym of Massospondylus
  Afromimus
  Afrovenator
  Agathaumas - possible synonym of Triceratops
  Aggiosaurus – a metriorhynchid crocodilian
  Agilisaurus
  Agnosphitys - a silesaurid dinosauromorph
  Agrosaurus – probably a junior synonym of Thecodontosaurus
  Agujaceratops
  Agustinia
  Ahshislepelta
  Airakoraptor - nomen nudum
  Ajancingenia - synonym of Heyuannia
  Ajkaceratops
  Akainacephalus
  Alamosaurus
  Alaskacephale
  Albalophosaurus
  Albertaceratops
  Albertadromeus
  Albertavenator
  Albertonykus
  Albertosaurus
  Albinykus
  Albisaurus – a non-dinosaurian reptile
  Alcovasaurus
  Alectrosaurus
  Aletopelta
  Algoasaurus
  Alioramus
  Aliwalia – junior synonym of Eucnemesaurus
  Allosaurus
  Almas
  Alnashetri
  Alocodon
  Altirhinus
  Altispinax
  Alvarezsaurus
  Alwalkeria
  Alxasaurus
  Amargasaurus
  Amargastegos - nomen nudum
  Amargatitanis
  Amazonsaurus
  ‘’Ambopteryx’’
  Ammosaurus - junior synonym of Anchisaurus
  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
  Andhrasaurus - nomen nudum
  Angaturama – probable junior synonym of Irritator
  Angloposeidon – nomen nudum
  Angolatitan
  Angulomastacator
  Anhuilong
  Aniksosaurus
  Animantarx
  Ankistrodon – a proterosuchid archosauriform
  Ankylosaurus
  Anodontosaurus
  Anomalipes
  Anoplosaurus
  Anserimimus
  Antarctopelta
  Antarctosaurus
  Antetonitrus
  Anthodon – a pareiasaur
  Antrodemus – possibly a synonym of Allosaurus
  Anzu
  Aoniraptor
  Aorun
  Apatodon – possibly a junior synonym of Allosaurus
  Apatoraptor
  Apatosaurus
  Appalachiosaurus
  ‘’Aquilarhinus’’
  Aquilops
  Aragosaurus
  Aralosaurus
  Araucanoraptor – nomen nudum; Neuquenraptor
  Archaeoceratops
  Archaeodontosaurus
  Archaeopteryx
  Archaeoraptor – a chimaera of the bird Yanornis and the dromaeosaur Microraptor
  Archaeornis – junior synonym of Archaeopteryx
  Archaeornithoides
  Archaeornithomimus
  Arcovenator
  Arctosaurus – some sort of non-dinosaurian reptile
  Arcusaurus
  Arenysaurus
  Argentinosaurus
  Argyrosaurus
  Aristosaurus – junior synonym of Massospondylus
  Aristosuchus
  Arizonasaurus – a rauisuchian
  Arkansaurus
  Arkharavia
  Arrhinoceratops
  Arstanosaurus
  Asiaceratops
  Asiamericana –  a fish
  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
  Austroposeidon
  Austroraptor
  Austrosaurus
  Avaceratops
  Avalonia – preoccupied name, now known as Avalonianus
  Avalonianus – a non-dinosaurian archosaur
  Aviatyrannis
  Avimimus
  Avipes – probably a non-dinosaurian dinosauromorph
  Avisaurus – an enantiornithine bird
  Azendohsaurus – a non-dinosaurian archosauromorph
caption: Artist's restoration of Archaeoceratops.
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