Danny Rubin (born 1957) is an American screenwriter, actor, lecturer, and celebrity blogger. He co-wrote with Harold Ramis the screenplay for the comedy film Groundhog Day (1993), for which the two received a BAFTA Film Award for Best Screenplay.
Rubin received a B.A. in biology from Brown University and a M.A. in radio, television, and film from Northwestern University. He has taught screenwriting at numerous universities and lectured on the topic at academic conferences since 1995. He is currently a Briggs-Copeland Lecturer on English at Harvard University.