Denis Maurice O'Conor (Irish: Donnchadh Muirgheas Ó Conchubhair Donn; 24 July 1840 – 26 July 1883) was an Irish barrister and Liberal Party politician who represented County Sligo in the House of Commons.
The second son of Denis O'Conor, O'Conor Don and the brother of Charles Owen O'Conor, O'Conor Don, Denis Maurice O'Conor was educated at Downside School and the University of London, graduating MA in 1861 and LLD in 1866.[1] He was called to the bar by the Middle Temple in Easter Term, 1866. A magistrate for County Roscommon, he was High Sheriff of Roscommon for 1865.[1]
A Liberal and a Home Ruler, O'Conor represented County Sligo in the House of Commons from December 1868 until his death.[1]