Denis O'Conor (1794 – 1847) of Clonalis, County Roscommon, was an Irish nobleman, the O'Conor Don and Member of Parliament (MP) in the British House of Commons.
He married, in 1824, Mary Anne, daughter of Major Blake, of Towerbill, County Mayo, and was the father of Charles Owen O'Conor and Denis Maurice O'Conor.
He was MP for Roscommon from 1831 to 1847. He became a Junior Lord of the Treasury in Lord John Russell's government but died the next year.
| Parliament of the United Kingdom | ||
|---|---|---|
| Preceded by Owen O'Conor |
Member of Parliament for Roscommon 1831 – 1847 |
Succeeded by Oliver Grace |
| Political offices | ||
| Preceded by Henry Bingham Baring William Cripps Swynford Carnegie Ralph Neville |
Junior Lord of the Treasury 1846 – 1847 |
Succeeded by Richard Bellew |