List of Famous people with last name O-neill

The Honourable Arthur Edward Bruce O'Neill, was an Irish Ulster Unionist Party politician who was the first Member of Parliament to be killed in World War I.

Sir Brian McPhelim Bacagh O'Neill was a lord of Lower Clandeboye, a Gaelic lordship in north-eastern Ireland during the Tudor period.

Sir Turlough Lynagh O'Neill was an Irish Gaelic lord of Tír Eoghain in early modern Ireland. He was inaugurated upon Shane O’Neill’s death, becoming The O'Neill. From 1567 to 1595, Sir Turlough Luineach O'Neill was leader of the O'Neill clan, the most powerful family in Ulster, the northern province in Ireland. He was knighted in 1578.

Sir Cormac MacBaron O'Neill (d.1613) was an Irish soldier and landowner of the Elizabethan and early Stuart eras. He was part of the O'Neill dynasty, one of the most prominent Gaelic family in Ireland.

Reverend William O'Neill, 1st Baron O'Neill was an Anglo-Irish hereditary peer, clergyman and musical composer. Born William Chichester, he changed his surname to O'Neill in 1855.

Shane O'Neill, 3rd Earl of Tyrone was the youngest son of Hugh O'Neill, Earl of Tyrone.