John Maywood Grubb, Jr. (born August 4, 1948) is an American former Major League Baseball outfielder and designated hitter, who also occasionally played at first base.

He played with the San Diego Padres (1972–1976), Cleveland Indians (1977–1978), Texas Rangers (1978–1982), and the Detroit Tigers (1983–1987).

Grubb made the 1974 National League All-star team during his sophomore season, and struck out in his only at-bat.

He was nearly dealt along with Sparky Lyle from the Rangers to the Philadelphia Phillies for Tug McGraw, Bake McBride and Larry Christenson at the 1979 Winter Meetings in Toronto, but the proposed transaction was never executed because a deferred money issue in Lyle's contract went unresolved.

He was the former varsity baseball coach at his alma mater, Meadowbrook High School in Richmond.