William O'Neill
William O'Neill or Bill O'Neill may refer to:
- Bill O'Neill (baseball) (1880–1920), baseball player
- Bill O'Neill (bowler) (born 1981), professional ten-pin bowler
- Bill O'Neill (media) (born 1936), News Corporation executive
- Billy O'Neill (1878–1955), Welsh rugby player
- Buckey O'Neill (1860–1898), Old West sheriff and U.S. Army officer killed at the Battle of San Juan Hill
- C. William O'Neill (1916–1978), Governor of Ohio
- William O'Neil (born 1933), entrepreneur and stockbroker who founded the newspaper Investor's Business Daily
- William O'Neill, 1st Baron O'Neill (1813–1883), Anglo-Irish hereditary peer, clergyman and musical composer
- William O'Neill (Connecticut politician) (1930–2007), Governor of Connecticut in the 1980s and early 1990s
- William O'Neill (Medal of Honor) (1848–?), American soldier in the Indian Wars
- William O'Neill (Ohio jurist) (born 1947), appellate judge and 2008 candidate for U.S. Representative from Ohio's 14th congressional district
- Willie O'Neill (1940–2011), Scottish footballer (Celtic FC)
- Willie O'Neill (1900s hurler), see List of All-Ireland Senior Hurling Championship medal winners
- Willie O'Neill (1960s hurler), see Gerald McCarthy (hurler)
- Willie O'Neill (Irish footballer), see 1938 FIFA World Cup qualification (UEFA – Group 2/Group 3/Group 5)
See also