Robert William Stewart (June 24, 1915 - December 20, 1981) was a professional baseball umpire who worked in the American League from 1958 to 1970. Stewart umpired 1,958 major league games in his 13-year career. He umpired in three World Series (1961, 1965 and 1970), two All-Star Games (1962 and 1969) and the 1969 American League Championship Series.