Lyall Austin Dagg (July 27, 1929 – May 14, 1975) was a Canadian curler and World Champion. He won a gold medal at the 1964 World Curling Championships. Outside of curling, he was employed as an account executive.Dagg died at the age of 45 from a rare blood disorder. He was survived by his wife Shirley and at least four children. He was inducted into the Canadian Curling Hall of Fame in 2000.Dagg was of Irish, Scottish, English and Dutch descent.