Men's 400 metres world record progression

The first world record in the 400 m for men (athletics) was recognized by the International Amateur Athletics Federation, now known as World Athletics, in 1912. The IAAF ratified Charles Reidpath's 48.2 s performance set at that year's Stockholm Olympics as a world record, but it also recognized the superior mark over 440 yards (402.34 metres) run by Maxie Long in 1900 as a world record.

Up to and including 2021, World Athletics has ratified 24 world records in the event.^[1]

The following tables show the world record progression in the men's 400 metres, as ratified by World Athletics.

^ "12th IAAF World Championships In Athletics: IAAF Statistics Handbook. Berlin 2009" (PDF). Monte Carlo: IAAF Media & Public Relations Department. 2009. pp. Pages 546, 547. Archived from the original (PDF) on June 29, 2011. Retrieved August 2, 2009.

[iaaf-1] "12th IAAF World Championships In Athletics: IAAF Statistics Handbook. Berlin 2009" (PDF). Monte Carlo: IAAF Media & Public Relations Department. 2009. pp. Pages 546, 547. Archived from the original (PDF) on June 29, 2011. Retrieved August 2, 2009.

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