The men's 800 metres was an event at the 1980 Summer Olympics in Moscow, Soviet Union. There were a total number of 41 participating athletes from 28 nations, with six qualifying heats, three semifinals, and the final held on Saturday July 26, 1980. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The event was won by Steve Ovett of Great Britain, the nation's first gold medal in the men's 800 metres since winning four in a row from 1920 to 1932. It was Great Britain's sixth overall title in the event.