Gregory Joseph Colbrunn (born July 26, 1969 in Fontana, California) is the current hitting coach for the Boston Red Sox of Major League Baseball. Primarily a first baseman during his active career, he played in the Major Leagues for 13 seasons and seven different teams. He threw and batted right-handed and was listed at 6 feet (1.8 m) tall and 190 pounds (86 kg).
Colbrunn was part of the victorious Arizona Diamondbacks 2001 World Series winning team.
After serving as the hitting coach of the Charleston RiverDogs, the Single-A South Atlantic League affiliate of the New York Yankees, Colbrunn was promoted to manager for the 2010 season.