Athletics at the 1936 Summer Olympics – Men's 400 metres
The men's 400 metres sprint event at the 1936 Olympic Games took place in early August. Forty-two athletes from 25 nations competed. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The final was won by American Archie Williams, the third consecutive and seventh overall title in the event for the United States. Godfrey Brown's silver was Great Britain's first medal in the event since 1924.