List of Famous people with last name Dungannon

Matthew O'Neill, 1st Baron Dungannon, was an Irish aristocrat. He was accepted by Conn O'Neill as his natural son. Matthew was challenged by his half-brother Shane O'Neill over the succession to the Earldom of Tyrone and was murdered by some of his supporters.

Brian Ó Néill, Baron Dungannon was an Irish aristocrat of the Elizabethan era. He was part of the O'Neill dynasty, a powerful Gaelic family in Ulster. Brian's father was Matthew O'Neill, 1st Baron Dungannon who had been given his title by Henry VIII as part of the surrender and regrant policy. Matthew was assassinated by his half-brother and rival Shane O'Neill in 1558. Shane tried to have the government recognise Matthew and his sons as illegitimate, but they continued to be supported by the Viceroy the Earl of Sussex in Dublin.

Arthur Hill-Trevor, 3rd Viscount Dungannon, of Whittlebury, Northamptonshire, was an English Conservative Party politician for New Romney and the City of Durham.