The men's hammer throw was one of four men's throwing events on the Athletics at the 1964 Summer Olympics program in Tokyo. It was held on 17 October and 18 October 1964, with the qualification on the first day and the final the next. 25 athletes from 14 nations entered, with 1 not starting in the qualification round. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The event was won by Romuald Klim of the Soviet Union, the nation's second consecutive victory in the men's hammer throw. Gyula Zsivótzky of Hungary repeated as silver medalist, the fifth man to win multiple medals in the event. Uwe Beyer took bronze, the first medal for the United Team of Germany and the first medal for any German hammer thrower since 1952.

At the 1964 Summer Olympics in Tokyo, the athletics competition included 36 events, 24 for men and 12 for women. The women's 400 metres and women's pentathlon events were newly introduced at these Games. There were a total number of 1016 participating athletes from 82 countries.