The men's 4 × 400 metres relay was the longer of the two men's relays on the Athletics at the 1964 Summer Olympics program in Tokyo.

[1] The final of the 4 × 400 relay was the last event on the athletics schedule to begin, though the marathon was still in progress when the 4 × 400 finished.

Carr moved from initial position to anchor for the United States team as they set a new world record, followed closely by Great Britain and Northern Ireland as well as Trinidad and Tobago.

All three teams were under the old world record time.

France also shuffled their lineup, moving Nelzy to third from first.