Harry O'Neill

Harry O'Neill may refer to:
 * Harry P. O'Neill (1889–1953), U.S. Representative from Pennsylvania
 * Harry O'Neill (One Life to Live), a character from the soap opera One Life to Live 
 * Harry O'Neill (pitcher) (1892–1969), Major League Baseball pitcher, 1922–1923
 * Harry O'Neill (catcher) (1917–1945), Major League Baseball player killed in World War II
 * Harry O'Neill (footballer, born 1894), English footballer for The Wednesday, Bristol Rovers and Swindon Town
 * Harry O'Neill (footballer, born 1908), English footballer for Cardiff City