Charles O'Hara (16 April 1746 – 19 September 1822) was an Irish landowner and politician. He was born the son of Charles O'Hara (1715–1776) of Annaghmore, County Sligo, an MP in the Parliament of Ireland. He was educated at Christ Church, Oxford and entered the Middle Temple in 1765 to study law. He was called to the Irish bar in 1771 and succeeded his father in 1776. He married Margaret, the daughter and heiress of John Cookson, MD, of Yorkshire, with whom he had a son and 3 daughters.