World record progression 400 metres individual medley

The first world record in the 400 metres individual medley in long course (50 metres) swimming was recognized by the International Swimming Federation (FINA) in 1957, followed by the women a year later. In the short course (25 metres) swimming events the world's governing body recognizes world records since March 3, 1991.

Men long course

 * Correct as of April 2024

Men short course

 * Correct as of December 2023

Women long course

 * Correct as of May 2024

Women short course

 * Correct as of December 2022