Gregory Walcott (born Bernard Wasdon Mattox, January 13, 1928 – March 20, 2015) was an American film and television actor.

Roger Havilland on the 1960s police procedural series 87th Precinct, and appeared in several films starring his real-life friend Clint Eastwood.

He appeared in Western films, beginning with an uncredited role in Red Skies of Montana (1952), then later more prominently as a gunslinger who tries to romance Claudette Colbert in 1955's Texas Lady.

Walcott had roles in many television series, including that of Stone Kenyon in two episodes of the NBC sitcom, The People's Choice with Jackie Cooper.

He made a cameo appearance in the 1994 Ed Wood bio-pic starring Johnny Depp, directed by Tim Burton, which was Walcott's final role.