Henry O'Neill (1891–1961) was an American film actor.
Henry O'Neill may also refer to: Henry O'Neill (d. 1347), king of Tyrone Henry O'Neill (illustrator) (1798–1880), Irish artist and antiquarian Henry O'Neill, 2nd Baron Dungannon, held title Baron Dungannon Sir Henry O'Neill, 3rd Baronet (c. 1674–1759) of the O'Neill baronets Sir Henry O'Neill, 1st Baronet (1625-c. 1680) of the O'Neill baronets Henry E. O'Neill (1848–1925), British explorer of Central Africa Henry MacShane O'Neill (died 1622), leader of the MacShane (not to be confused with MacShane's of Loughinsholin) Sir Henry Og MacShane, son of Henry MacShane O'Neill; see Henry O'Neill (bishop) (1843–1915), Irish bishop of Dromore Henry O'Neill (soldier) (c. 1586–1610), Irish-born soldier Henry O'Neill (rugby union), Irish international rugby union player
See also Harry O'Neill (disambiguation) Henry O'Neil (disambiguation) Henrique O'Neill, 1st Viscount of Santa Mónica (1823–1889), Portuguese writer and politician Henry O'Neal, in Flirtation Walk