Robert Byington (born April 29, 1971) is an American film director, screenwriter and actor living in Austin, Texas.

He is most noted for his films RSO (Registered Sex Offender) (2008), Harmony and Me (2009), Somebody Up There Likes Me (2012), winner of The Special Jury Prize at the 2012 Locarno Film Festival, 7 Chinese Brothers (2015) starring Jason Schwartzman, Olympia Dukakis and Tunde Adebimpe, Infinity Baby (2017) starring Kieran Culkin, Nick Offerman, and Martin Starr, and Lousy Carter (2023) starring David Krumholtz, Olivia Thirlby, and Starr.

The Los Angeles Times described his film Harmony and Me as a "collision of joyous whimsy and bittersweet melancholy.

Notable actors Byington has cast in two or more of his films include Nick Offerman, Stephen Root, Kristen Tucker, Martin Starr, Megan Mullally, Keith Poulson, Kevin Corrigan, David Krumholtz and Suzy Nakamura.

Offerman is also the narrator of Byington's Frances Ferguson, a film with a discomforting subject matter, which star Kaley Wheless calls an "offbeat comedy, not for everybody" (https://thewest.com.au/entertainment/movies/revelation-perth-international-film-festival-kaley-wheless-is-one-of-cinemas-more-endearing-sex-predators-in-frances-ferguson-ng-b881604528z).