1991 World Championships in Athletics – Men's 400 metres

These are the official results of the Men's 400 metres event at the 1991 IAAF World Championships in Tokyo, Japan. There were a total of 46 participating athletes, with six qualifying heats and the final held on Thursday August 29, 1991. The winning margin was 0.05 seconds.

Schedule

 * All times are Japan Standard Time (UTC+9)

Semifinals

 * Held on Tuesday 1991-08-27

Quarterfinals

 * Held on Monday 1991-08-26

Qualifying heats

 * Held on Sunday 1991-08-25