Pierre St.-Jean (alternate listings: Pierre St-Jean, Pierre Saint-Jean, born March 28, 1943 in Montreal) is a Canadian weightlifter who competed from the mid 1960s to the mid 1970s. At the 1976 Summer Olympics in Montreal, he took the Athlete's Oath.
St.-Jean also competed in three Summer Olympics, earning his best finish of tenth in the light heavyweight (85 kg) category at Mexico City in 1968.
He now resides Pointe-Claire, Quebec.