Swimming at the 1991 Pan American Games – Men's 400 metre freestyle

The men's 400 metre freestyle competition of the swimming events at the 1991 Pan American Games took place on 16 August. The last Pan American Games champion was Paul Robinson of US.

This race consisted of eight lengths of the pool, with all eight being in the freestyle stroke.

Results
All times are in minutes and seconds.

Final
The final was held on August 16.