Michael O'Neill may refer to: Michael O'Neill (diplomat) (born 1965), British diplomat Michael O'Neill (academic) (born 1953), English poet and academic Michael O'Neill (actor), American actor Michael O'Neill (educator), pioneer in non-profit management education Michael O'Neill (footballer) (born 1969), Northern Irish former footballer Michael O'Neill (politician) (1909–1976), Irish politician Michael E. O'Neill (born c. 1948), chairman of Citigroup Mike O'Neill (basketball) (born 1927), American basketball player Mike O'Neill (baseball) (1877–1959), starting pitcher and left fielder in Major League Baseball Mike O'Neill (ice hockey) (born 1967), retired professional ice hockey goaltender Mike O'Neill (lacrosse), three-time All-American lacrosse player Mike O'Neill (musician), Canadian singer-songwriter Mike O'Neill (rugby league) (born 1960), English rugby league footballer of the 1970s, 1980s and 1990s Mike O'Neill, winner of a 2006 Costume Designers Guild Award Michael O'Neill is the founder of the Involuntary Medication Objectors (Vaccination/Fluoride) Party, a minor political party in Australia