Shawn O'Sullivan (born May 9, 1962 in Toronto, Ontario) is a retired Canadian boxer who won gold at the World Amateur Championships in 1981 and the light middleweight silver medal at the 1984 Summer Olympics.

[4] O'Sullivan, who himself had benefited from a controversial decision against Christophe Tiozzo in the semifinals, was gracious in defeat and called the outcome "unfortunate".

[5] His results were: O'Sullivan began his professional career that same year and won his first 11 bouts in the welterweight division.

He lost in his 12th fight to future titlist Simon Brown by TKO in the 3rd in 1986 in Toronto's Exhibition Place.

[6] O'Sullivan quit boxing in 1988 after consecutive defeats to Luis Santana and Donovan Boucher, but he launched a pair of short-lived comebacks in 1991 and 1996.