Swimming at the 1979 Pan American Games – Women's 100 metre breaststroke

The women's 100 metre breaststroke competition of the swimming events at the 1979 Pan American Games took place on 3 July at the Piscina Olimpica Del Escambron. The last Pan American Games champion was Lauri Siering of US.

This race consisted of two lengths of the pool, both lengths being in breaststroke.

Results
All times are in minutes and seconds.

Heats
The first round was held on July 3.

Final
The final was held on July 3.