Swimming at the 1983 Pan American Games – Men's 400 metre individual medley
# Swimming at the 1983 Pan American Games – Men's 400 metre individual medley

The men's 400 metre individual medley competition of the swimming events at the 1983 Pan American Games took place on 18 August. The last Pan American Games champion was Jesse Vassallo of US.

This race consisted of eight lengths of the pool. The first two lengths were swum using the butterfly stroke, the second pair with the backstroke, the third pair of lengths in breaststroke, and the final two were freestyle.

## Results

All times are in minutes and seconds.

| KEY: | q | Fastest non-qualifiers | Q | Qualified | GR | Games record | NR | National record | PB | Personal best | SB | Seasonal best |
| - | - | - | - | - | - | - | - | - | - | - | - | - |

### Final

The final was held on August 18.

| Rank | Name | Nationality | Time | Notes |
| - | - | - | - | - |
| | Ricardo Prado | Brazil | 4:21.43 | GR |
| | Jeff Kostoff | United States | 4:27.99 | |
| | Mike O'Brien | United States | 4:30.45 | |
| 4 | Peter Dobson | Canada | 4:30.45 | |
| 5 | Roger Madruga | Brazil | 4:34.01 | |
| 6 | Cam Reid | Canada | 4:37.16 | |
| 7 | Andrey Aguilar | Costa Rica | 4:41.98 | |
| 8 | Enrique Leite | Uruguay | 4:47.72 | |
