Hugh O'Neill, 3rd Baron Rathcavan

Hugh Detmar Torrens O'Neill, 3rd Baron Rathcavan (born 14 June 1939), is a British hereditary peer and businessman who sat as a crossbencher in the House of Lords from 1994 until 1999.

He was educated at Eton College.

O'Neill ran Lamont, a textile company in Northern Ireland, in the 1980s and was chairman of the Northern Ireland Tourist Board before taking on the Brasserie St Quentin in Knightsbridge in 2002.