Denis Armar O'Conor, O'Conor Don (Irish: Donnchadh Ó Conchubhair Donn; 1912–10 July 2000) was hereditary Chief of the Name O'Conor, and is a direct descendant of Tairrdelbach Ua Conchobair, the last High King of Ireland with a surviving male-line lineage and was seen by some as a nominal claimant to that defunct position.