Henry Purdon (c. 1687–1737) was an Irish barrister, politician and Law Officer of the early eighteenth century. He sat in the Irish House of Commons and held the Crown office of Third Serjeant. Purdon was born in County Cork, to a junior branch of a family, originally from Cumberland in England, which had acquired substantial lands in County Clare in the early seventeenth century; Henry's branch of the family settled at Ballyclogh, County Cork. He was the son of Adam Purdon and his wife Mary Clayton, and grandson of Sir Nicholas Purdon (died 1678), who was MP for Baltimore in the time of Charles II, and his wife Alice Stephens. Bartholomew Purdon, who was High Sheriff of County Cork in 1708, and MP successively for several County Cork constituencies, was Henry's first cousin.