| 28 from 8 nations|| 57.88|
| Sydney International Aquatic Centre|
August 22, 1999 (heats &
August 23, 1999 (final)
The women's 100 metre butterfly competition at the 1999 Pan Pacific Swimming Championships took place on August 22–23 at the Sydney International Aquatic Centre. The last champion was Jenny Thompson of US.
This race consisted of two lengths of the pool, all in butterfly.
1999 Pan Pacific Swimming Championships – Women's 100 metre butterfly Wikipedia
Prior to this competition, the existing world and Pan Pacific records were as follows:
All times are in minutes and seconds.
The first round was held on August 22.
The semifinals were held on August 22.
The final was held on August 23.