The Richard Riot was a riot on March 17, 1955 (Saint Patrick's Day), in Montreal, Quebec, Canada. The riot was named after Maurice Richard, the star ice hockey player for the Montreal Canadiens of the National Hockey League (NHL). Following a violent altercation on March 13 in which Richard hit a linesman, NHL president Clarence Campbell suspended him for the remainder of the 1954–55 NHL season, including the playoffs. Montreal fans protested that the suspension was too severe; the team's largely Francophone fan base claimed the length of the suspension was motivated by Richard's French Canadian ethnicity. Outside of Montreal, however, the suspension was seen as justified and, if anything, too short.
On March 17, Campbell appeared at the Montreal Forum for the Canadiens' first game after Richard's suspension. His presence provoked a riot at the Forum that spilled into the streets. The riot caused an estimated $100,000 in property damage, thirty-seven injuries, and 100 arrests. Tensions eased after Richard made a personal plea accepting his punishment and promising to return the following year to help the team win the Stanley Cup. The incident likely cost Richard the 1954–55 scoring title (a feat Richard never achieved in his NHL career), played a role in the off-season departure of longtime Canadiens head coach Dick Irvin, and was a precursor to the Quiet Revolution.