The 1976 Summer Olympics (French: Jeux olympiques d'été de 1976), officially known as the Games of the XXI Olympiad (French: Jeux de la XXIe Olympiade) and commonly known as Montreal 1976 (French: Montréal 1976), were an international multi-sport event held from July 17 to August 1, 1976 in Montreal, Quebec, Canada. Montreal was awarded the rights to the 1976 Games at the 69th IOC Session in Amsterdam on May 12, 1970, over the bids of Moscow and Los Angeles. It was the first and, so far, only Summer Olympic Games to be held in Canada. Toronto hosted the 1976 Summer Paralympics the same year as the Montreal Olympics, which still remains the only Summer Paralympics to be held in Canada. Calgary and Vancouver later hosted the Winter Olympic Games in 1988 and 2010, respectively.

Twenty-nine countries, mostly African, boycotted the Montreal Games when the International Olympic Committee (IOC) refused to ban New Zealand, after the New Zealand national rugby union team had toured South Africa earlier in 1976 in defiance of the United Nations' calls for a sporting embargo. The Soviet Union won the most gold- and overall medals.