Dennis O'Neill

'''Dennis O'Neill''' may refer to:

*Dennis O'Neill (baseball) (1866–1912), 19th-century baseball player *Dennis O'Neill (manslaughter victim), British manslaughter victim *Dennis O'Neill (rugby league), rugby league footballer of the 1970s for Great Britain, and Widnes *Dennis O'Neill (tenor) (born 1948), Welsh tenor Provided by Wikipedia