Greg Riddoch (born July 17, 1945 in Greeley, Colorado) is a former manager in Major League Baseball. He was the manager of the San Diego Padres from 1990 to 1992. His career record was 200-194. During his career, he also served as a bench coach for the Padres, as well as third base coach for the Tampa Bay Devil Rays and director of scouting for the Milwaukee Brewers and Cincinnati Reds. He retired following a stint as manager for the Eugene Emeralds, a single-A team affiliated with the Padres.