Horace "Lefty" Gwynne (October 5, 1912 – April 16, 2001) was a bantamweight professional boxer from Canada, who competed in the 1930s and won the gold medal at the 1932 Summer Olympics.

Born in Toronto, Gwynne left school after grade 8, weighing only 65 lb (29.5 kg).

When he started to grow, he began working out in Stokley's Gym in Toronto to lose weight in order to become a jockey.

Gwynne won the Canadian amateur bantamweight title, which sent him to the 1932 Summer Olympics in Los Angeles, despite his having fought only fifteen bouts before the Games.

He won the Olympic gold medal match against the German Hans Ziglarski, knocking him down in the second round and winning on points.