Stephen George Ridzik (April 29, 1929 – January 8, 2008) was an American right-handed pitcher in Major League Baseball who played for five teams from 1950 to 1966, primarily the Philadelphia Phillies and Washington Senators. Ridzik signed with the Washington Senators three years later in 1963 after developing a knuckleball. He would appear in 132 games, mostly in relief, over the next three years for the Senators. On April 13, 1966, his contract was sold back to his original team, the Phillies. He would appear in two games with the Phillies that year before calling it a career.