These are the official results of the men's 400 metres event at the 1983 IAAF World Championships in

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. There were a total number of 55 participating athletes, with seven qualifying heats and the final held on 10 August 1983.

Records

Existing records at the start of the event.

Results

Qualifying heats

The qualifying heats took place on 7 August, with the 55 athletes involved being splitted into 7 heats. The first 3 athletes in each heat ( Q ) and the next 11 fastest ( q ) qualified for the quarter-finals. ;Heat 1 ;Heat 2 ;Heat 3 ;Heat 4 ;Heat 5 ;Heat 6 ;Heat 7

Quarterfinals

The qualifying heats took place on 8 August, with the 32 athletes involved being splitted into 4 heats. The first 4 athletes in each heat ( Q ) qualified for the semifinals. ;Heat 1 ;Heat 2 ;Heat 3 ;Heat 4

Semifinals

The semifinals took place on 9 August, with the 16 athletes involved being splitted into 2 heats. The first 4 athletes in each heat ( Q ) qualified for the final. ;Heat 1 ;Heat 2

Final

The final took place on August 10.

References

Results
{{DEFAULTSORT:1983 World Championships In Athletics - Men's 400 Metres 400 metres at the World Athletics Championships