Athletics at the 1979 Pan American Games – Women's 100 metres

The women's 100 metres sprint competition of the athletics events at the 1979 Pan American Games took place on 7 and 8 July at the Estadio Sixto Escobar. The defending Pan American Games champion was Pamela Jiles of the United States.

Records
Prior to this competition, the existing world and Pan American Games records were as follows:

Results
All times shown are in seconds.

Heats
Held on 7 July

Wind: Heat 1: +1.4 m/s, Heat 2: +1.6 m/s, Heat 3: +1.4 m/s

Semifinals
Held on 7 July

Wind: Heat 1: +0.9 m/s, Heat 2: +2.7 m/s

Final
Held on 8 July

Wind: +0.9 m/s