Robert Rafael Reisz is a Canadian paleontologist and specialist in the study of early amniote and tetrapod evolution.

He conducted field work in North America, Africa, and Europe, where he excavated fossils from the late Paleozoic and early Mesozoic eras.

He has published more than 100 scientific articles on subjects as diverse as lungfish and dinosaurs, but is best known for his work on early amniotes.

He was a Senior Visiting Scientist at the Paleontological Institute of the Russian Academy of Science, Moscow (1989–2003) and Invited Professor at the Muséum national d'Histoire naturelle, Paris (2000–2003).

In 2007, Reisz was honored by the American Association for the Advancement of Science (AAAS) and was recognized as a Fellow.