The men's horizontal bar was a gymnastics event contested as part of the Gymnastics at the 1964 Summer Olympics programme at the Tokyo Metropolitan Gymnasium. The event was held on 18, 20, and 23 October. There were 128 competitors from 29 nations, with nations in the team competition having up to 6 gymnasts and other nations entering up to 3 gymnasts. The event was won by Boris Shakhlin of the Soviet Union, the nation's first victory in the horizontal bar after two Games with silver and bronze medals. The Soviets also took silver, with Yuri Titov finishing second. Shakhlin (bronze in 1960) and Titov (silver in 1956) were the fifth and sixth men to win multiple medals in the horizontal bar. Bronze went to Miroslav Cerar of Yugoslavia.