Luke Daniel Hamlin (July 3, 1904 – February 18, 1978) was an American professional baseball pitcher.

He played in Major League Baseball (MLB) for the Detroit Tigers (1933–34), Brooklyn Dodgers (1937–41), Pittsburgh Pirates (1942), and Philadelphia Athletics (1944).

Born in Ferris Center, Michigan, Hamlin won the nickname "Hot Potato" because of his tendency to juggle the ball while getting ready to pitch.

Dodgers manager Leo Durocher lost faith in "Hot Potato", who had blown a number of leads over the 1941 season.

But Durocher complied with the boss's order and started Hamlin, who gave up 4 runs before getting an out and lasted only 2 innings.