The men's 800 metres event at the 2000 Summer Olympics as part of the athletics programme was held at Stadium Australia on Saturday 23 September, Monday 25 September, and Wednesday 27 September 2000. Sixty-one athletes from 46 nations competed. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The event was won by 0.06 seconds by Nils Schumann of Germany, the first men's 800 metres championship for a German runner and the first medal in the event for the nation since 1952. Denmark and Algeria each won their first medal in the men's 800 metres.