Okay here are some Dinosaurs with names that start with the letter a. List: Ankylosaurus, Acanthopholis, Acrocanthosaurus, Albertosaurus, Allosaurus, Abelisaurus, Achelousaurus, Actiosaurus, Adasaurus, Aegyptosaurus, Aeolosaurus, Aepisaurus, Afrovenator, Agathaumas, Agilisaurus, Agrosaurus, Alamosaurus, Alectrosaurus, Alioramus, Algosaurus, Aliwalia, Alocodon, Altirhinus, Altispinax, Alvarezsaurus, Apatosaurus, Alwalkeria, Alxasaurus, Amargasaurus, Ammosaurus, Ampelosaurus, Amphicoelias, Amtosaurus, Amphisaurus, Amygdalodon, Amurosaurus, Anchisaurus, Anatosaurus, Anatotitan, Anchisauripus, Anchiceratops,
