Guillaume Lemay-Thivierge (born February 28, 1976 in Saint-Jérôme, Quebec) is a Canadian actor and film producer best known for major roles in Quebec films Nitro and The 3 L'il Pigs (Les 3 p'tits cochons) in 2007.
After participating in a first commercial ad at the age of 6, Thivierge's career started very early at the age of 8 when he had his first minor television and film roles on Épopée rock, Manon, Les annees des reves, Le Matou and La Dame en couleurs in 1984 and 1985.
However, it was in the mid-2000s whereThivierge started to play lead roles in Nitro as well as in the 3 L'il pigs, two of the biggest box-office Quebec hits in 2007. Another notable role was in Lance et Compte: Le Revanche in 2006, where he played a paraplegic lawyer defending one of the fictional National de Quebec hockey who was charged with second degree murder and later for involuntary homicide following an on-ice incident where a player died from his injuries following a check from the accused player.