J. K. L. Ross | |
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| Born | John Kenneth Leveson Ross 31 March 1876 Lindsay, Ontario, Canada |
| Died | 25 July 1951 (aged 75) |
| Education | Bishop's College School |
| Alma mater | McGill University |
| Occupation(s) | Businessman, philanthropist and racehorse owner/breeder |
| Spouse(s) | Ethel Matthews (m. 1902; div. 1930) Iris de Lisser (m. 1931) |
| Children | James K. M. Ross Hylda A. M. Ross Hodgson |
| Parent(s) | James Ross and Annie Kerr |
Commander John Kenneth Leveson "Jack" Ross, CBE (31 March 1876 – 25 July 1951) was a Canadian businessman, sportsman, thoroughbred racehorse owner/breeder, and philanthropist. He is best remembered for winning the first United States Triple Crown of Thoroughbred Racing in 1919 with his Hall of Fame colt, Sir Barton. In 1911, he set the world record for catching the largest tuna (680 lb; 308 kg) by rod and line at St. Anns, Nova Scotia. After his father, he was the second Canadian to be made a member of the Royal Yacht Squadron.