The finals and the qualifying heats of the women's 100 metre butterfly event at the 1998 World Aquatics Championships were held on Thursday 15 January 1998 in Perth, Western Australia.
| Women's 100 metre butterfly at the 1998 FINA World Championships | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Date | 15 January 1998 | |||||||||
| Winning time | 58.46 seconds | |||||||||
| Medalists | ||||||||||
| ||||||||||
A Final edit
| Rank | Name | Time |
|---|---|---|
|
 Jenny Thompson (USA)
|
58.46 CR |
|
 Ayari Aoyama (JPN)
|
58.79 |
|
 Petria Thomas (AUS)
|
58.97 |
| 4 | Misty Hyman (USA)
|
59.12 |
| 5 | Susie O'Neill (AUS)
|
59.27 |
| 6 |  Martina Moravcová (SVK)
|
59.47 |
| 7 |  Inge de Bruijn (NED)
|
1:00.09 |
| 8 | Hitomi Kashima (JPN)
|
1:00.43 |
B Final edit
| Rank | Name | Time |
|---|---|---|
| 9 |  Mette Jacobsen (DEN)
|
1:00.71 |
| 10 |  Johanna Sjöberg (SWE)
|
1:00.99 |
| 11 |  Katrin Jäke (GER)
|
1:01.24 |
| 12 | Sophia Skou (DEN)
|
1:01.43 |
| 13 |  Elena Nazemnova (RUS)
|
1:01.55 |
| 14 |  Cécile Jeanson (FRA)
|
1:01.57 |
| 15 |  Jessica Deglau (CAN)
|
1:01.61 |
| 16 |  Anna Nyiry (HUN)
|
1:01.98 |