Fred Ingels Peterson (born February 8, 1942) is a former Major League Baseball (MLB) player who played for the New York Yankees, Cleveland Indians, and Texas Rangers from 1966 to 1976.
Peterson was a southpaw starting pitcher who enjoyed his best success in 1970 with the Yankees when he went 20–11 and pitched in the All-Star game.
He is widely known for trading families with teammate Mike Kekich in the early 1970s.
He had a career record of 133–131.
Fritz Peterson has the lowest ratio of base on balls per innings pitched for any left-handed pitcher to pitch in the major leagues since the 1920s.