The men's 400 metres hurdles event at the 1960 Olympic Games took place between August 31 and September 2. There were 34 competitors from 23 nations. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The event was won by Glenn Davis of the United States, the first man to successfully defend an Olympic title in the 400 metres hurdles. As of the 2016 Games, he remains the only man to do so; three others have won two gold medals in the event, but all three did so in nonconsecutive Games. It was the United States' fifth consecutive and 10th overall victory in the event. The Americans also completed their second consecutive (and fourth overall) medal sweep in the event, as Cliff Cushman took silver and Dick Howard took bronze.