Alfred Masson Robertson (October 20, 1911 - September 4, 1975) was a Hall of Fame jockey in American Thoroughbred horse racing. Robertson was born in Aberdeen, Scotland, the son of Georgina Watson and her husband Ross Robertson. The Robertson family emigrated to the United States when Alfred was young. His father became a Thoroughbred racehorse owner/trainer and Alfred began his professional career in 1927 riding for his father. Alfred's mother's family emigrated to Toronto, Ontario, Canada, and her brother, Alexander Watson, was also involved in Thoroughbred racing. Alexander's son, Bobby Watson, was a Canadian Horse Racing Hall of Fame jockey who "absolutely dominated horse racing in Ontario in the 1940s".