Swimming at the 1964 Summer Olympics – Women's 100 metre butterfly
The women's 100 metre butterfly event at the 1964 Olympic Games took place on October 14 and October 16. This swimming event used the butterfly stroke. Because an Olympic size swimming pool is 50 metres long, this race consisted of two lengths of the pool.Medalists
Results
Heats
Heat 1
Heat 1
| Rank | Athlete | Country | Time | Note |
| 1 | Kathy Ellis | | 1:07.8 | Q, |
| 2 | Eiko Takahashi | | 1:08.4 | Q |
| 3 | Judy Gegan | | 1:10.8 | Q |
| 4 | Adrie Lasterie | | 1:11.2 | |
| 5 | Linda McGill | | 1:11.7 | |
| 6 | Ursel Brunner | | 1:13.6 | |
| 7 | Molly Tay | | 1:23.0 | |
Heat 2
| Rank | Athlete | Country | Time | Note |
| 1 | Donna de Varona | | 1:07.5 | Q, |
| 2 | Mary Anne Cotterill | | 1:09.4 | Q |
| 3 | Mary Beth Stewart | | 1:09.9 | Q |
| 4 | Kimiko Sato | | 1:10.6 | Q |
Heat 3
| Rank | Athlete | Country | Time | Note |
| 1 | Ada Kok | | 1:07.8 | Q |
| 2 | Eila Pyrhönen | | 1:07.9 | Q |
| 3 | Marianne Humeniuk | | 1:09.5 | Q |
| 4 | Márta Egerváry | | 1:10.3 | Q |
| 5 | Tetiana Dev'iatova | | 1:11.1 | |
| 6 | Jenny Wood | | 1:11.3 | |
| 7 | Ann Lallande | | 1:17.1 | |
Heat 4
| Rank | Athlete | Country | Time | Note |
| 1 | Sharon Stouder | | 1:07.0 | Q, |
| 2 | Ute Noack | | 1:09.2 | Q |
| 3 | Valentyna Yakovleva | | 1:11.2 | |
| 4 | Helen Kennedy | | 1:11.2 | |
| 5 | Hiroko Saito | | 1:13.1 | |
| 6 | Gillian de Greenlaw | | 1:14.8 | |
| 7 | Margaret Harding | | 1:23.7 | |
Heat 5
| Rank | Athlete | Country | Time | Note |
| 1 | Glenda Phillips | | 1:10.3 | Q |
| 2 | Anna Maria Cecchi | | 1:10.3 | Q |
| 3 | Heike Hustede-Nagel | | 1:10.5 | Q |
| 4 | Silvia Belmar | | 1:12.1 | |
| 5 | María Ballesté | | 1:13.1 | |
| 6 | Jan Turner | | 1:14.4 | |
Semifinals
Semifinal 1
Semifinal 2
Final
| Rank | Athlete | Country | Time | Notes |
| Sharon Stouder | | 1:04.7 | WR |
| Ada Kok | | 1:05.6 | |
| Kathy Ellis | | 1:06.0 | |
| 4 | Eila Pyrhönen | | 1:07.3 | |
| 5 | Donna de Varona | | 1:08.0 | |
| 6 | Heike Hustede-Nagel | | 1:08.5 | |
| 7 | Eiko Takahashi | | 1:09.1 | |
| 8 | Mary Beth Stewart | | 1:10.0 | |
Key: WR = World record
