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George McKinley Barr (July 19, 1892 – July 26, 1974) was an American professional baseball umpire who was a pioneer in Umpiring Instruction. Barr worked in the National League from 1931 to 1949. Barr umpired 2,757 major league games in his 19-year career. He umpired in four World Series (1937, 1942, 1948, 1949) and two All-Star Games (1937 and 1944). Barr was founder of the George Barr Umpire School, the earliest umpire training school and author of the first book on umpiring. Barr was a pioneer in using the inside chest protector.