What is a person who studies dinosaurs called?

A paleontologist

A person who studies dinosaurs is called a paleontologist (pay-lee-yon-TOH-luh-jist)

paleontologist is the Word for someone who studies fossils. i dont think there is a specific Word for someone who focuses o dinosaurs though

Anyone who studies prehistoric life is called a Palaeontologist or Paleontologist (American spelling)

A more informal term for someone who specifically studies dinosaurs is a Dinosaurologist.

Modern day birds are are theropod dinosaurs. So anyone who studies birds is an ornithologist.