| | Event type
100 metres Butterfly, Women
| Date | 14 – 16 October 1964 |
|---|---|
| Status | Olympic |
| Location | Kokuritsu Yoyogi Kyogijo, Shibuya, Tokyo |
| Participants | 31 from 16 countries |
The three favorites were American teenagers Kathy Ellis and Sharon Stouder, and the Dutch world record holder, Ada Kok. All three made the finals easily, with Ellis and Stouder winning the semi-finals. In the final Stouder led from the start and won by over one metre from Kok, with Ellis in third. Stouder finished in 1:04.7 to better Kok’s world record. It was her first gold medal of the Tokyo Olympics, but she would eventually win three golds (two in relays) and a silver in the 100 freestyle. In Budapest in August 1965, Kok re-took the world record by posting 1:04.5. Kok would continue swimming internationally, placing fourth in this event at Mexico City in 1968.
| Pos | Swimmer | NOC | R1 | SF | Final | |||
|---|---|---|---|---|---|---|---|---|
| 1 | Sharon Stouder |  USA | 1:07.0 (1 h4) | 1:05.6 (1 h1) | 1:04.7 (1) | Gold | ||
| 2 | Ada Kok |  NED | 1:07.8 (1 h3) | 1:05.9 (2 h1) | 1:05.6 (2) | Silver | ||
| 3 | Kathy Ellis | USA | 1:07.8 (1 h1) | 1:07.2 (1 h2) | 1:06.0 (3) | Bronze | ||
| 4 | Eila Pyrhönen |  FIN | 1:07.9 (2 h3) | 1:07.9 (3 h1) | 1:07.3 (4) | |||
| 5 | Donna de Varona | USA | 1:07.5 (1 h2) | 1:07.7 (2 h2) | 1:08.0 (5) | |||
| 6 | Heike Hustede |  GER | 1:10.5 (3 h5) | 1:08.8 (5 h2) | 1:08.5 (6) | |||
| 7 | Eiko Takahashi |  JPN | 1:08.4 (2 h1) | 1:07.8 (3 h2) | 1:09.1 (7) | |||
| 8 | Mary Beth Stewart |  CAN | 1:09.9 (3 h2) | 1:08.6 (4 h2) | 1:10.0 (8) | |||
| 9 | Marianne Humeniuk | CAN | 1:09.5 (3 h3) | 1:09.2 (4 h1) | – | |||
| 10 | Ute Noack | GER | 1:09.2 (2 h4) | 1:09.3 (5 h1) | – | |||
| 11 | Mary Anne Cotterill |  GBR | 1:09.4 (2 h2) | 1:09.4 (6 h2) | – | |||
| 12 | Anna Maria Cecchi |  ITA | 1:10.3 (2 h5) | 1:10.4 (7 h2) | – | |||
| 13 | Judy Gegan | GBR | 1:10.8 (3 h1) | 1:10.5 (8 h2) | – | |||
| 14 | Glenda Phillips | GBR | 1:10.3 (1 h5) | 1:10.6 (6 h1) | – | |||
| 15 | Márta Egerváry |  HUN | 1:10.3 (4 h3) | 1:10.7 (7 h1) | – | |||
| 16 | Kimiko Sato | JPN | 1:10.6 (4 h2) | 1:11.2 (8 h1) | – | |||
| 17 | Tatyana Devyatova |  URS | 1:11.1 (5 h3) | – | – | |||
| =18 | Louise Kennedy | CAN | 1:11.2 (4 h4) | – | – | |||
| =18 | Adrie Lasterie | NED | 1:11.2 (4 h1) | – | – | |||
| =18 | Valentina Yakovleva | URS | 1:11.2 (3 h4) | – | – | |||
| 21 | Jenny Wood |  ZIM | 1:11.3 (6 h3) | – | – | |||
| 22 | Linda McGill |  AUS | 1:11.7 (5 h1) | – | – | |||
| 23 | Silvia Belmar |  MEX | 1:12.1 (4 h5) | – | – | |||
| =24 | María Ballesté |  ESP | 1:13.1 (5 h5) | – | – | |||
| =24 | Hiroko Saito | JPN | 1:13.1 (5 h4) | – | – | |||
| 26 | Ursel Brunner | GER | 1:13.6 (6 h1) | – | – | |||
| 27 | Jan Turner | AUS | 1:14.4 (6 h5) | – | – | |||
| 28 | Gillian de Greenlaw | AUS | 1:14.8 (6 h4) | – | – | |||
| 29 | Ann Lallande |  PUR | 1:17.1 (7 h3) | – | – | |||
| 30 | Molly Tay |  MAS | 1:23.0 (7 h1) | – | – | |||
| 31 | Margaret Harding | PUR | 1:23.7 (7 h4) | – | – | |||
| Éva Erdélyi | HUN | – (DNS h2) | – | – | ||||
| Judit Turóczy | HUN | – (DNS h5) | – | – | ||||
| Hrafnhildur Guðmundsdóttir |  ISL | – (DNS h5) | – | – | ||||
| Lotten Andersson |  SWE | – (DNS h3) | – | – |
Round One (14 October 1964 — 11:20)
Fastest 16 advanced to the semi-finals.
Heat One
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | 2 | Kathy Ellis | USA | 1:07.8 | |||
| 2 | 3 | Eiko Takahashi | JPN | 1:08.4 | |||
| 3 | 5 | Judy Gegan | GBR | 1:10.8 | |||
| 4 | 6 | Adrie Lasterie | NED | 1:11.2 | |||
| 5 | 4 | Linda McGill | AUS | 1:11.7 | |||
| 6 | 1 | Ursel Brunner | GER | 1:13.6 | |||
| 7 | 7 | Molly Tay | MAS | 1:23.0 |
Heat Two
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | 6 | Donna de Varona | USA | 1:07.5 | |||
| 2 | 3 | Mary Anne Cotterill | GBR | 1:09.4 | |||
| 3 | 2 | Mary Beth Stewart | CAN | 1:09.9 | |||
| 4 | 4 | Kimiko Sato | JPN | 1:10.6 | |||
| 5 | Éva Erdélyi | HUN | – |
Heat Three
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | 4 | Ada Kok | NED | 1:07.8 | |||
| 2 | 7 | Eila Pyrhönen | FIN | 1:07.9 | |||
| 3 | 3 | Marianne Humeniuk | CAN | 1:09.5 | |||
| 4 | 6 | Márta Egerváry | HUN | 1:10.3 | |||
| 5 | 1 | Tatyana Devyatova | URS | 1:11.1 | |||
| 6 | 5 | Jenny Wood | ZIM | 1:11.3 | |||
| 7 | 2 | Ann Lallande | PUR | 1:17.1 | |||
| 4 | Lotten Andersson | SWE | – |
Heat Four
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | 2 | Sharon Stouder | USA | 1:07.0 | |||
| 2 | 5 | Ute Noack | GER | 1:09.2 | |||
| 3 | 7 | Valentina Yakovleva | URS | 1:11.2 | |||
| 4 | 1 | Louise Kennedy | CAN | 1:11.2 | |||
| 5 | 4 | Hiroko Saito | JPN | 1:13.1 | |||
| 6 | 6 | Gillian de Greenlaw | AUS | 1:14.8 | |||
| 7 | 3 | Margaret Harding | PUR | 1:23.7 |
Heat Five
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | 6 | Glenda Phillips | GBR | 1:10.3 | |||
| 2 | 3 | Anna Maria Cecchi | ITA | 1:10.3 | |||
| 3 | 4 | Heike Hustede | GER | 1:10.5 | |||
| 4 | 1 | Silvia Belmar | MEX | 1:12.1 | |||
| 5 | 7 | María Ballesté | ESP | 1:13.1 | |||
| 6 | 5 | Jan Turner | AUS | 1:14.4 | |||
| 8 | Judit Turóczy | HUN | – | ||||
| 2 | Hrafnhildur Guðmundsdóttir | ISL | – |
Semi-Finals (15 October 1964 — 18:35)
Fastest eight advanced to the final.
Heat One
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | 4 | Sharon Stouder | USA | 1:05.6 | |||
| 2 | 5 | Ada Kok | NED | 1:05.9 | |||
| 3 | 3 | Eila Pyrhönen | FIN | 1:07.9 | |||
| 4 | 2 | Marianne Humeniuk | CAN | 1:09.2 | |||
| 5 | 6 | Ute Noack | GER | 1:09.3 | |||
| 6 | 7 | Glenda Phillips | GBR | 1:10.6 | |||
| 7 | 1 | Márta Egerváry | HUN | 1:10.7 | |||
| 8 | 8 | Kimiko Sato | JPN | 1:11.2 |
Heat Two
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | 5 | Kathy Ellis | USA | 1:07.2 | |||
| 2 | 4 | Donna de Varona | USA | 1:07.7 | |||
| 3 | 3 | Eiko Takahashi | JPN | 1:07.8 | |||
| 4 | 2 | Mary Beth Stewart | CAN | 1:08.6 | |||
| 5 | 1 | Heike Hustede | GER | 1:08.8 | |||
| 6 | 6 | Mary Anne Cotterill | GBR | 1:09.4 | |||
| 7 | 7 | Anna Maria Cecchi | ITA | 1:10.4 | |||
| 8 | 8 | Judy Gegan | GBR | 1:10.5 |
Final (16 October 1964 — 19:35)
| Pos | Lane | Swimmer | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | 4 | Sharon Stouder | USA | 1:04.7 | |||
| 2 | 5 | Ada Kok | NED | 1:05.6 | |||
| 3 | 3 | Kathy Ellis | USA | 1:06.0 | |||
| 4 | 7 | Eila Pyrhönen | FIN | 1:07.3 | |||
| 5 | 6 | Donna de Varona | USA | 1:08.0 | |||
| 6 | 8 | Heike Hustede | GER | 1:08.5 | |||
| 7 | 2 | Eiko Takahashi | JPN | 1:09.1 | |||
| 8 | 1 | Mary Beth Stewart | CAN | 1:10.0 |