Tom Cannon Sr. (April 1846 – 13 July 1917) was a British flat racing jockey and trainer. He won 13 British classics as a jockey, becoming champion in 1872. As a trainer, he trained classic winners, as well as winners over jumps, including the 1888 Grand National. He was the father of four jockey sons, including the six-times champion, Morny Cannon, and the great-grandfather of eleven-times champion, Lester Piggott.