The men's 800 metres was the middle of the seven men's track races in the Athletics at the 1964 Summer Olympics program in Tokyo. 47 athletes from 32 nations competed. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The first round was held on 14 October, with the semifinals on 15 October and the final on 16 October. The event was won by Peter Snell of New Zealand, successfully defending his 1960 gold medal (the third man to do so), and completing the first half of his 800 metres/1500 metres double. Bill Crothers of Canada took silver, the first 800 metres medal for that nation since 1936 and matching Canada's best-ever result in the event (silver in 1932). Wilson Kiprugut's bronze was the first medal by Kenya in any event; Kenya would become a