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

The women's 4 × 100 metre medley relay competition of the swimming events at the 1979 Pan American Games took place on 2 July at the Piscina Olimpica Del Escambron. The last Pan American Games champion was the United States.

Results
All times are shown in minutes and seconds.

Final
The final was held on July 2.