Richard Allen Dietz (September 18, 1941 – June 28, 2005) was an American professional baseball player and manager. He played in Major League Baseball as a catcher from 1966 to 1973, most prominently as a member of the San Francisco Giants where he was an All-Star player and was a member of the team that won the 1971 National League Western Division title. He also played for the Los Angeles Dodgers and the Atlanta Braves. After his playing career, Dietz worked as a minor league manager in the Giants organization.