# Swimming at the 2005 World Aquatics Championships – Women's 100 metre butterfly

The Women's 100 Butterfly event at the 11th FINA World Aquatics Championships swam on 24–25 July 2005 in Montreal, Canada. Preliminary and Semifinal heats swam on 24 July. The Final swam in the evening session of 25 July.
At the start of the event, the existing World (WR) and Championships (CR) records were:
* WR: 56.61 swum by Inge de Bruijn (Netherlands) on 17 September 2000 in Sydney, Australia
* CR: 57.96 swum by Jenny Thompson (USA) on 21 July 2003 in Barcelona, Spain

## Results
### Final

| Place | Swimming | Nation | Time | Notes |
| 1 | Jessicah Schipper | Australia | 57.23 | CR |
| 2 | Libby Lenton | Australia | 57.37 | |
| 3 | Otylia Jędrzejczak | Poland | 58.57 | |
| 4 | Rachel Komisarz | USA | 58.80 | |
| 5 | Mary DeScenza | USA | 58.87 | |
| 6 | Inge Dekker | Netherlands | 59.01 | |
| 7 | Martina Moravcová | Slovakia | 59.25 | |
| 8 | ZHOU Yafei | China | 59.42 | |

### Semifinals

| Rank | Heat + Lane | Swimmer | Nation | Time | Notes |
| 1 | S2 L4 | Jessicah Schipper | Australia | 57.75 | q, CR |
| 2 | S1 L5 | Lisbeth Lenton | Australia | 58.11 | q |
| 3 | S2 L5 | Otylia Jędrzejczak | Poland | 58.19 | q |
| 4 | S1 L4 | Inge Dekker | Netherlands | 58.73 | q |
| 5 | S2 L3 | Mary DeScenza | USA | 58.88 | q |
| 6 | S1 L3 | Rachel Komisarz | USA | 58.93 | q |
| 7 | S2 L6 | Martina Moravcová | Slovakia | 59.02 | q |
| 8 | S2 L2 | ZHOU Yafei | China | 59.17 | q |
| 9 | S1 L6 | Annika Mehlhorn | Germany | 59.39 | |
| 10 | S1 L2 | Ambra Migliori | Italy | 59.54 | |
| 11 | S2 L7 | Yuko Nakanishi | Japan | 59.65 | |
| 12 | S2 L7 | Natalia Sutiagina | Russia | 59.95 | |
| 13 | S1 L1 | Francesca Segat | Italy | 1:00.01 | |
| 14 | S2 L8 | Audrey Lacroix | Canada | 1:00.33 | |
| 15 | S1 L8 | Rosalind Brett | Great Britain | 1:00.34 | |
| 16 | S2 L1 | Mandy Loots | South Africa | 1:00.36 | |

### Preliminaries

| Rank | Heat + Lane | Swimmer | Nation | Time | Notes |
| 1 | H6 L4 | Jessicah Schipper | Australia | 57.91 | q, CR |
| 2 | H6 L5 | Inge Dekker | Netherlands | 58.48 | q |
| 3 | H8 L4 | Otylia Jędrzejczak | Poland | 58.83 | q |
| 4 | H7 L4 | Libby Lenton | Australia | 59.05 | q |
| 5 | H8 L3 | Mary DeScenza | United States | 59.13 | q |
| 6 | H7 L5 | Rachel Komisarz | United States | 59.19 | q |
| 7 | H8 L5 | Martina Moravcová | Slovakia | 59.33 | q |
| 8 | H7 L6 | Annika Mehlhorn | Germany | 59.36 | q |
| 9 | H6 L2 | ZHOU Yafei | China | 59.42 | q |
| 10 | H7 L2 | Ambra Migliori | Italy | 59.60 | q |
| 11 | H6 L6 | Natalia Sutiagina | Russia | 59.98 | q |
| 12 | H8 L2 | Yuko Nakanishi | Japan | 1:00.00 | q |
| 13 | H8 L6 | Mandy Loots | South Africa | 1:00.09 | q |
| 14 | H7 L3 | Francesca Segat | Italy | 1:00.35 | q |
| 15 | H6 L1 | Audrey Lacroix | Canada | 1:00.36 | q |
| 15 | H8 L7 | Rosalind Brett | Great Britain | 1:00.36 | q |
| 17 | H7 L8 | Ayako Doi | Japan | 1:00.72 | |
| 18 | H7 L7 | Beatrix Boulsevicz | Hungary | 1:00.79 | |
| 18 | H8 L1 | Elizabeth Coster | New Zealand | 1:00.79 | |
| 20 | H6 L3 | Malia Metella | France | 1:00.91 | |
| 21 | H5 L5 | Diane Bui Duyet | France | 1:01.01 | |
| 22 | H6 L7 | Lyubov Korol | Ukraine | 1:01.04 | |
| 23 | H8 L8 | Gabriella Fagundez | Sweden | 1:01.07 | |
| 24 | H6 L8 | Kelly Stefanyshyn | Canada | 1:01.10 | |
| 25 | H7 L1 | Aleksandra Urbanczyk | Poland | 1:01.60 | |
| 26 | H5 L6 | Vasilisa Vladykina | Russia | 1:01.69 | |
| 27 | H5 L2 | Hang Yu Su | Hong Kong | 1:01.81 | |
| 28 | H3 L5 | Heather Brand | Zimbabwe | 1:01.91 | |
| 29 | H4 L2 | Jeanette Ottesen | Denmark | 1:02.23 | |
| 30 | H5 L8 | Denisa Smolenová | Slovakia | 1:02.36 | |
| 31 | H4 L3 | You-Ri Kwon | South Korea | 1:02.49 | |
| 32 | H5 L1 | Hannah Wilson | Hong Kong | 1:02.50 | |
| 33 | H5 L4 | Joscelin Yeo | Singapore | 1:02.51 | |
| 34 | H4 L8 | Annette Hansen | Denmark | 1:02.63 | |
| 35 | H5 L3 | Hye Ra Choi | South Korea | 1:02.69 | |
| 36 | H5 L7 | Jingzhi Tang | China | 1:03.02 | |
| 37 | H4 L6 | Chanelle Van Wyk | South Africa | 1:03.05 | |
| 38 | H4 L5 | Chin-Kuei Yang | Chinese Taipei | 1:03.70 | |
| 39 | H4 L7 | Georgina Toomey | New Zealand | 1:03.82 | |
| 40 | H3 L4 | Irina Shlemova | Uzbekistan | 1:03.93 | |
| 41 | H4 L1 | Natnapa Prommuenwai | Thailand | 1:03.95 | |
| 42 | H3 L3 | Marcela Kubalčíková | Czech Republic | 1:04.03 | |
| 43 | H4 L4 | Bernadette Lee | Singapore | 1:04.33 | |
| 44 | H3 L2 | Yamilé Bahamonde | Ecuador | 1:05.52 | |
| 45 | H3 L7 | Phan Thi Hanh | Vietnam | 1:05.60 | |
| 46 | H3 L1 | Gisela Morales | Guatemala | 1:05.79 | |
| 47 | H2 L4 | Lacken Malateste | Tahiti | 1:05.87 | |
| 48 | H2 L5 | Fatima Valderrama | Peru | 1:05.88 | |
| 49 | H3 L6 | Angela Galea | Malta | 1:05.97 | |
| 50 | H3 L8 | Ashley Aitken | Bermuda | 1:06.32 | |
| 51 | H2 L2 | Davina Mangion | Malta | 1:07.18 | |
| 52 | H2 L3 | Ana Guadalupe Hernandez Duarte | El Salvador | 1:07.28 | |
| 53 | H2 L7 | Sharon Fajardo | Honduras | 1:07.54 | |
| 54 | H2 L1 | Ileana Ivette Murillo Argueta | El Salvador | 1:07.63 | |
| 55 | H2 L8 | Simona Muccioli | San Marino | 1:08.14 | |
| 56 | H1 L5 | Melissa Vincent | Mauritius | 1:08.26 | |
| 57 | H2 L6 | Cheok Mei Ma | Macau | 1:08.64 | |
| 58 | H1 L4 | Binta Zahra Diop | Senegal | 1:09.30 | |
| 59 | H1 L6 | Sana Wahid | Pakistan | 1:15.74 | |
| -- | -- | Jessica Vieira | Mozambique | DNS | |