# Swimming at the 2004 Summer Olympics – Women's 100 metre butterfly

The women's 100 metre butterfly event at the 2004 Olympic Games was contested at the Olympic Aquatic Centre of the Athens Olympic Sports Complex in Athens, Greece on August 14 and 15.
Australia's Petria Thomas, who finished fourth in Sydney, won her first individual gold medal in this event, outside the Olympic record time of 57.72 seconds. The silver medal was awarded to Poland's Otylia Jędrzejczak, who trailed behind Thomas by 0.12 of a second, in an outstanding time of 57.84. Defending Olympic champion and world record holder Inge de Bruijn of the Netherlands, on the other hand, took home the bronze at 57.99 seconds.

## Records

Prior to this competition, the existing world and Olympic records were as follows.
| World record | Inge de Bruijn (NED) | 56.61 | Sydney, Australia | 17 September 2000 |
| Olympic record | Inge de Bruijn (NED) | 56.61 | Sydney, Australia | 17 September 2000 |

## Results
### Heats

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | 4 | Petria Thomas | Australia | 57.47 | Q |
| 2 | 4 | 5 | Otylia Jędrzejczak | Poland | 57.84 | Q, NR |
| 3 | 5 | 5 | Inge de Bruijn | Netherlands | 58.47 | Q |
| 4 | 3 | 4 | Martina Moravcová | Slovakia | 58.48 | Q |
| 5 | 5 | 7 | Jessicah Schipper | Australia | 58.57 | Q |
| 6 | 4 | 4 | Jenny Thompson | United States | 58.77 | Q |
| 7 | 5 | 3 | Junko Onishi | Japan | 59.22 | Q |
| 8 | 5 | 6 | Malia Metella | France | 59.38 | Q |
| 8 | 3 | 3 | Rachel Komisarz | United States | 59.38 | Q |
| 10 | 4 | 2 | Ambra Migliori | Italy | 59.47 | Q |
| 11 | 5 | 1 | Franziska van Almsick | Germany | 59.53 | Q, WD |
| 12 | 4 | 6 | Zhou Yafei | China | 59.62 | Q |
| 13 | 3 | 2 | Natalya Sutyagina | Russia | 59.76 | Q |
| 14 | 3 | 5 | Alena Popchanka | Belarus | 59.77 | Q |
| 15 | 2 | 4 | Mette Jacobsen | Denmark | 59.81 | Q |
| 16 | 4 | 3 | Anna-Karin Kammerling | Sweden | 59.84 | Q |
| 17 | 3 | 1 | Yuko Nakanishi | Japan | 1:00.16 | Q |
| 18 | 3 | 8 | Beatrix Boulsevicz | Hungary | 1:00.18 | |
| 19 | 2 | 3 | Eirini Kavarnou | Greece | 1:00.43 | |
| 20 | 4 | 1 | Georgina Lee | Great Britain | 1:00.45 | |
| 21 | 4 | 8 | Chantal Groot | Netherlands | 1:00.49 | |
| 22 | 5 | 8 | Francesca Segat | Italy | 1:00.56 | |
| 23 | 2 | 5 | Elizabeth Coster | New Zealand | 1:00.61 | |
| 23 | 3 | 6 | Johanna Sjöberg | Sweden | 1:00.61 | |
| 25 | 4 | 7 | Aurore Mongel | France | 1:00.65 | |
| 26 | 3 | 7 | Vered Borochovski | Israel | 1:00.69 | |
| 27 | 2 | 6 | Joscelin Yeo | Singapore | 1:00.81 | |
| 28 | 5 | 2 | Xu Yanwei | China | 1:01.53 | |
| 29 | 2 | 2 | Maria Papadopoulou | Cyprus | 1:02.01 | |
| 30 | 1 | 6 | Kateryna Zubkova | Ukraine | 1:02.22 | |
| 31 | 2 | 1 | Kolbrún Yr Kristjánsdóttir | Iceland | 1:02.33 | |
| 32 | 2 | 8 | Sze Hang Yu | Hong Kong | 1:02.42 | |
| 33 | 2 | 7 | Park Kyung-hwa | South Korea | 1:02.52 | |
| 34 | 1 | 4 | Cheng Wan-jung | Chinese Taipei | 1:02.94 | |
| 35 | 1 | 5 | Gülşah Günenç | Turkey | 1:04.30 | |
| 36 | 1 | 2 | Angela Galea | Malta | 1:05.47 | |
| 37 | 1 | 3 | Mariya Bugakova | Uzbekistan | 1:07.08 | |
| 38 | 1 | 7 | Natasha Sara Georgeos | Saint Lucia | 1:07.94 | |

### Semifinals
#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Otylia Jędrzejczak | Poland | 58.10 | Q |
| 2 | 5 | Martina Moravcová | Slovakia | 58.66 | Q |
| 3 | 3 | Jenny Thompson | United States | 58.91 | Q |
| 4 | 6 | Rachel Komisarz | United States | 59.34 | |
| 5 | 2 | Ambra Migliori | Italy | 59.53 | |
| 5 | 8 | Yuko Nakanishi | Japan | 59.53 | |
| 7 | 1 | Mette Jacobsen | Denmark | 59.72 | |
| 8 | 7 | Natalya Sutyagina | Russia | 59.79 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | Inge de Bruijn | Netherlands | 57.50 | Q |
| 2 | 4 | Petria Thomas | Australia | 57.93 | Q |
| 3 | 3 | Jessicah Schipper | Australia | 58.63 | Q |
| 4 | 1 | Alena Popchanka | Belarus | 58.97 | Q |
| 5 | 6 | Junko Onishi | Japan | 59.24 | Q |
| 5 | 2 | Malia Metella | France | 59.28 | |
| 7 | 8 | Anna-Karin Kammerling | Sweden | 59.33 | |
| 8 | 7 | Zhou Yafei | China | 59.48 | |

### Final

| Rank | Lane | Swimmer | Nation | Time |
| | 5 | Petria Thomas | Australia | 57.72 |
| | 3 | Otylia Jędrzejczak | Poland | 57.84 |
| | 4 | Inge de Bruijn | Netherlands | 57.99 |
| 4 | 6 | Jessicah Schipper | Australia | 58.22 |
| 5 | 7 | Jenny Thompson | United States | 58.72 |
| 6 | 2 | Martina Moravcová | Slovakia | 58.96 |
| 7 | 1 | Alena Popchanka | Belarus | 59.06 |
| 8 | 8 | Junko Onishi | Japan | 59.83 |