Brian O'Neill
Brian O'Neill may refer to:
Arts and entertainment
- Brian D. O'Neill, American author and attorney
- Brian O'Neill (journalist), English and Irish journalist and author
- Brian O'Neill, fictional Irish gangster in ''Mafia II''
Sports
- Brian O'Neill (ice hockey, born 1929), Canadian executive in the National Hockey League
- Brian O'Neill (ice hockey, born 1988), American ice hockey player
- Brian O'Neill (American football), American football offensive tackle
Others
- Brian McPhelim O'Neill, lord of Lower Clandeboye
- Brian MacArt O'Neill, member of the O'Neill Dynasty
- Brian J. O'Neill, American politician
- Brian O'Neill (superintendent), American superintendent of the Golden Gate National Recreation Area
- Brian O'Neill, High King of Ireland
- Brian C. O'Neill, American earth system scientist and demographer
- Brian O'Neill, Baron Dungannon, Irish aristocrat
- Sir Brian O'Neill, 2nd Baronet, Irish landowner, barrister and judge
- Brian O'Neill (died 1617), seventeenth-century Irish noble