John Peter Cusick (June 12, 1928 - November 17, 1989) was a right-handed shortstop in Major League Baseball for the Chicago Cubs and Boston Braves.

Cusick made his major league debut in the Cubs' sixth game, April 24, going 0-for-1 against Bill Werle of the Pittsburgh Pirates, but got his first major league hit in his next game, an RBI double off Kurt Krieger of St. Louis.

His first major league home run came in the second game of a May 13 doubleheader against Pittsburgh, off Pirates starter Murry Dickson.

Cusick struggled to maintain a decent batting average and lost his starting job, though he remained with the team all season.

After the season, the Cubs shipped Cusick to the Boston Braves in exchange for Bob Addis.