Guillaume LeBlanc (born April 14, 1962 in Sept-Îles, Quebec) is a Canadian retired race walker.

He specialised in the 20 km event.

LeBlanc won the 20 km event at the 1989 Jeux de la Francophonie.

He competed for Canada at the 1992 Summer Olympics held in Barcelona, Spain, where he won the silver medal in the 20 kilometre walk event.

This biographical article relating to Canadian athletics and track and field is a stub.