1999 Pan Pacific Swimming Championships – Women's 100 metre freestyle

The women's 100 metre freestyle competition at the 1999 Pan Pacific Swimming Championships took place on August 26–27 at the Sydney International Aquatic Centre. The last champion was Jenny Thompson of US.

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

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

Results
All times are in minutes and seconds.

Heats
The first round was held on August 26.

Semifinals
The semifinals were held on August 26.

Final
The final was held on August 27.