The eldest son of Denis O'Conor, he was educated at Downside School in England and became an Irish Liberal Party Member of Parliament (MP) for Roscommon from March 1860 until he was defeated at the 1880 general election.
He was also President of the Society for the Preserving the Irish Language, a precursor of the Gaelic League.
He married on the 21 April 1868, Georgina Mary Perry, the daughter of Thomas Perry of Bitham House, Warwickshire, England, with whom he had four sons; Denis Charles Joseph O'Conor, O'Conor Don2 Georgina died on the 18 August 1872 and he married on 16 September 1879 to Ellen Letitia More-O'Ferrall, the daughter of Lewis More O'Ferrall, of Lissard House, Co. Longford.
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