Swimming at the 1979 Pan American Games – Men's 4 × 100 metre medley relay

The men's 4 × 100 metre medley relay competition of the swimming events at the 1979 Pan American Games took place on 8 July at the Piscina Olimpica Del Escambron. The last Pan American Games champion was the United States.

Results
All times are in minutes and seconds.

Heats
The first round was held on July 8.

Final
The final was held on July 8.