Harry Graham Willis (26 January 1875 – 10 March 1943) was an English administrator in Southern Africa. Willis was the son of Henry Scott Willis, of Northfield, Trowbridge, Wiltshire, a wool merchant, and Caroline Bevan (née Horner), whose father had been headmaster of a private school. He was the younger brother of Major-General Edward Willis, Lieutenant Governor of Jersey 1929–34, and like his brothers was educated at Marlborough College.