Hugh O'Neill, 4th Baron Dungannon

Hugh O'Neill
Baron Dungannon's tomb in San Pietro in Montorio
4th Baron Dungannon
Tenure1587–1609
PredecessorHugh O'Neill, 3rd Baron Dungannon
SuccessorHenry O'Neill, 5th Baron Dungannon
Bornc.1585
Ulster, Ireland
Diedc. 23 September 1609 (aged 24)
Rome, Papal States
BuriedSan Pietro in Montorio, Rome
FatherHugh O'Neill, Earl of Tyrone
MotherSiobhán O'Donnell

Hugh O'Neill, 4th Baron Dungannon (Irish: Aodh Ó Néill; c.1585c. 23 September 1609) was an Irish nobleman. The eldest son of Hugh O'Neill, Earl of Tyrone, and Siobhán O'Donnell, he was considered the heir to the O'Neill clan, though he predeceased his father.

Dungannon accompanied his family and countrymen on the Flight of the Earls, leaving Ireland for mainland Europe. A few months after settling in Rome, Dungannon became violently ill after catching fever during a holiday to Ostia. A year later he died in Rome aged 24. He is buried alongside his father and two half-uncles in San Pietro in Montorio. His title was attainted on 28 October 1614.