William Martin Kelly (1892–1975), born in Westport, New Zealand was a rugby league football identity who enjoyed success in New Zealand and Australia as both a player and coach in the first half of the 20th century. He played for Wellington, the Balmain Tigers, New South Wales and for both the New Zealand and Australian national sides. He also had a long coaching career with five different clubs in the NSWRFL in the 1920s, 1930s and 1940s, and with New Zealand in 1932.