William Hillary Clarke (born 5 July 1933 in Toronto, Ontario) is a chartered Accountant, businessman and politician. Clarke served as a Progressive Conservative party member of the House of Commons of Canada. He entered national politics following his victory at Vancouver Quadra riding in the 1972 federal election. Clarke was re-elected at the riding in the 1974, 1979 and 1980 federal elections. Clarke served four consecutive terms, from the 29th through 32nd Canadian Parliaments.