Phelim Bacagh O'Neill (Irish: Feidhlimidh Bacach Ó Néill) was a lord of Clandeboye in 15th-century medieval Ireland.
A son of Niall Mór O'Neill, he succeeded his brother Brian Ballagh II to the lordship after his death in 1529.
He reigned until his own death in 1533, after which he was succeeded by his brother Niall Oge O'Neill.
Another was Hugh, whose son Hugh Óg McHugh O'Neill would become lord of a quarter of Lower Clandeboye.
[1][3] O'Neill's nickname bacach meant "the lame".