Robert John Duliba (born January 9, 1935) is a former Major League Baseball relief pitcher. The 5 ft 10 in (1.78 m), 185 lb (84 kg) right-hander played for the St. Louis Cardinals (1959–60, 1962), Los Angeles Angels (1963–1964), Boston Red Sox (1965) and Kansas City Athletics (1967). Traded to the Boston organization the following spring, Duliba appeared in 39 games for the 1965 Red Sox and led the team's pitching staff in earned run average (3.17). Duliba closed out his major league career with the A's in 1967, their last season in Kansas City.