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- "Aachenosaurus" = Aachenoxylon (roślina)
- Aardonyx
- "Abdallahsaurus" (nomen nudum)
- Abelisaurus
- Abrictosaurus
- Abrosaurus
- Abydosaurus
- Acanthopholis (nomen dubium)
- Achelousaurus
- Achillesaurus (?= Alvarezsaurus)
- Achillobator
- "Acracanthus" = Acrocanthosaurus
- Acristavus
- Acrocanthosaurus
- Acrotholus
- Actiosaurus (nomen dubium) - ?ichtiozaur
- Adamantisaurus
- Adasaurus
- Adeopapposaurus
- Aegyptosaurus
- Aeolosaurus
- Aepisaurus (nomen dubium)
- "Aepysaurus" = Aepisaurus
- Aerosteon
- Aetonyx = Massospondylus
- Afrovenator
- Agathaumas (nomen dubium)
- Aggiosaurus = Dakosaurus (krokodylomorf)
- Agilisaurus
- Agnosphitys (nie dinozaur?)
- Agrosaurus (nomen dubium) =?Thecodontosaurus
- Agujaceratops
- Agustinia (??nomen dubium)
- Ahshislepelta
- "Airakoraptor" (nomen nudum)
- Ajkaceratops
- Alamosaurus
- "'Alashansaurus" = Shaochilong
- Alaskacephale
- Albalophosaurus
- Albertaceratops
- Albertadromeus
- Albertonykus
- Albertosaurus
- Albinykus
- Albisaurus (nomen dubium) - archozaur
- Alectrosaurus
- Aletopelta
- Algoasaurus
- Alioramus (??= Tarbosaurus)
- Aliwalia = Eucnemesaurus
- Allosaurus
- Alnashetri
- Alocodon (nomen dubium)
- Altirhinus
- Altispinax (nomen dubium)
- Alvarezsaurus
- Alwalkeria
- Alxasaurus
- Amargasaurus
- Amargatitanis (?nomen dubium)
- Amazonsaurus
- Ammosaurus ?=Anchisaurus
- Ampelosaurus
- Amphicoelias
- "Amphicoelicaudia" = Huabeisaurus
- Amphisaurus = Anchisaurus
- Amtocephale
- Amtosaurus (nomen dubium)
- Amurosaurus
- Amygdalodon
- Anabisetia
- Anasazisaurus ?=Kritosaurus
- Anatosaurus = Edmontosaurus
- Anatotitan = Edmontosaurus
- Anchiceratops
- Anchiornis
- Anchisaurus
- Andesaurus
- Angaturama = Irritator
- "Angloposeidon" (nomen nudum)
- Angolatitan
- Angulomastacator
- "Anikosaurus" (nomen nudum)
- Aniksosaurus
- Animantarx
- Ankistrodon =?Proterosuchus (archozaur)
- Ankylosaurus
- Anodontosaurus = Euoplocephalus
- Anoplosaurus (nomen dubium)
- Anserimimus
- Antarctopelta
- Antarctosaurus
- Antetonitrus
- Anthodon = parejazauryd
- Antrodemus (nomen dubium)
- Aorun
- Apatodon (nomen dubium)
- Apatosaurus
- Appalachiosaurus
- Aragosaurus
- Aralosaurus
- "Arancanthus" = "Acracanthus"
- Araucanoraptor (nomen nudum) = Neuquenraptor
- Archaeoceratops
- Archaeodontosaurus
- Archaeopteryx
- Archaeoraptor = Microraptor
- Archaeornis = Archaeopteryx
- Archaeornithoides
- Archaeornithomimus
- Archaeovolans = Yanornis
- Arctosaurus = trilofozauryd lub żółw
- Arcusaurus
- Arenysaurus
- Argentinosaurus
- Argyrosaurus
- Aristosaurus = Massospondylus
- Aristosuchus
- Arizonasaurus = rauizuch
- "Arkanosaurus" = "Arkansaurus"
- "Arkansaurus" (nomen nudum)
- Arkharavia (chimera)
- Arrhinoceratops
- Arstanosaurus (nomen dubium)
- Asiaceratops
- Asiamericana
- Asiatosaurus
- Astrodon (?nomen dubium)
- Astrodonius = Astrodon
- Astrodontaurus = Astrodon
- "Astrodontonius" = Astrodon
- Astrophocaudia
- Asylosaurus
- Atacamatitan
- Atlantosaurus (nomen dubium)
- Atlasaurus
- Atlascopcosaurus (nomen dubium)
- Atrociraptor
- Atsinganosaurus
- Aublysodon (nomen dubium)
- Aucasaurus
- Augustia = Agustinia
- Auroraceratops
- Aurornis
- Australodocus
- Australovenator
- Austrocheirus
- Austroraptor
- Austrosaurus (nomen dubium)
- Avaceratops
- Avalonia = Camelotia
- Avalonianus = Camelotia
- Aviatyrannis
- Avimimus
- Avipes
- Avisaurus - ptak
- Azendohsaurus - nie dinozaur, archozauromorf
