Henry O'Neill (disambiguation)
Henry O'Neill was an American film actor.
Henry O'Neill may also refer to:
- Henry O'Neill (d. 1347), king of Tyrone
- Henry O'Neill (illustrator), Irish artist and antiquarian
- Henry O'Neill, 2nd Baron Dungannon, held title Baron Dungannon
- Sir Henry O'Neill, 3rd Baronet of the O'Neill baronets
- Sir Henry O'Neill, 1st Baronet of the O'Neill baronets
- Henry E. O'Neill, British explorer of Central Africa
- Henry MacShane O'Neill, leader of the MacShane
- * Sir Henry Og MacShane, son of Henry MacShane O'Neill; see
- Henry O'Neill (bishop), Irish bishop of Dromore
- Henry O'Neill (soldier), Irish-born soldier
- Henry O'Neill (rugby union), Irish international rugby union player