Timothy Leo Cullen (born February 16, 1942) is an American former professional baseball infielder. He played in Major League Baseball (MLB) for the Washington Senators (1966–67, 1968–71), Chicago White Sox (1968) and Oakland Athletics (1972). He batted and threw right-handed. In a six-season career, Cullen was a .220 hitter with nine home runs and 134 RBI in 700 games. Cullen is one of the few rookies in Major League Baseball to hit a come-from-behind walk-off home run (on Aug 18, 1967).