Karl Kaspar Keffer (1882 – October 22, 1955) was a Canadian professional golfer. He was the first and, as of 2019, remains the only Canadian-born winner of the Canadian Open. Keffer was born in Tottenham, Ontario. He was the head professional at the Royal Ottawa Golf Club for over thirty years until his retirement in 1943 due to ill health, and was a founder member of the PGA of Canada. Until 1942, he also worked as the professional at Jekyll Island Club on Jekyll Island, Georgia during the winters. His biggest achievements as a tournament player came in the national open championship, which he won twice, in 1909 and 1914, and finished as runner-up in 1919. He also won the provincial opens of Manitoba and Quebec.