# Swimming at the 2009 World Aquatics Championships – Women's 100 metre butterfly

The first heats of the Women's 100 m Butterfly took place on the morning of Sunday, 26 July. The semi-final took place in the evening session of 26 July and the final took place on the evening of 27 July at the Foro Italico in Rome, Italy. In the final, 7 of the 8 swimmers finished within the same second, and 5 within the same 0.1 of a second.

## Records

Prior to this competition, the existing world and competition records were as follows:
| World record | Inge de Bruijn (NED) | 56.61 | Sydney, Australia | 17 September 2000 |
| Championship record | Libby Lenton (AUS) | 57.15 | Melbourne, Australia | 26 March 2007 |
The following records were established during the competition:
| Date | Round | Name | Nationality | Time | Record |
| 26 July | Heat 9 | Sarah Sjöström | Sweden | 56.76 | CR |
| 26 July | Semifinal 2 | Sarah Sjöström | Sweden | 56.44 | WR |
| 27 July | Final | Sarah Sjöström | Sweden | 56.06 | WR |

## Results
### Heats

| Rank | Name | Nationality | Time | Heat | Lane | Notes |
| 1 | Sarah Sjöström | Sweden | 56.76 | 9 | 6 | CR, NR |
| 2 | Dana Vollmer | USA | 57.15 | 10 | 5 | |
| 3 | Jessicah Schipper | Australia | 57.17 | 10 | 4 | |
| 4 | Yafei Zhou | China | 57.34 | 10 | 8 | |
| 5 | Christine Magnuson | USA | 57.48 | 9 | 4 | |
| 6 | Jeanette Ottesen | Denmark | 57.58 | 10 | 7 | NR |
| 7 | Ingvild Snildal | Norway | 57.67 | 10 | 9 | NR |
| 8 | Aurore Mongel | France | 57.75 | 11 | 6 | NR |
| 9 | Felicity Galvez | Australia | 57.76 | 9 | 3 | |
| 10 | Jiao Liuyang | China | 57.90 | 11 | 5 | |
| 11 | Annika Mehlhorn | Germany | 58.04 | 9 | 7 | NR |
| 12 | Marleen Veldhuis | Netherlands | 58.06 | 11 | 4 | |
| 13 | Ellen Gandy | Great Britain | 58.07 | 9 | 5 | |
| 14 | Daynara de Paula | Brazil | 58.26 | 9 | 8 | |
| 15 | Yuka Kato | Japan | 58.31 | 10 | 6 | |
| 16 | Gabriella Silva | Brazil | 58.35 | 10 | 2 | |
| 17 | Jemma Lowe | Great Britain | 58.60 | 10 | 3 | |
| 18 | Eszter Dara | Hungary | 58.61 | 11 | 7 | |
| 19 | Kimberly Buys | Belgium | 58.62 | 9 | 1 | NR |
| 20 | Audrey Lacroix | Canada | 58.67 | 8 | 5 | NR |
| 21 | Irina Bespalova | Russia | 58.74 | 10 | 0 | |
| 22 | Ilaria Bianchi | Italy | 58.81 | 9 | 2 | |
| 23 | Triin Aljand | Estonia | 59.00 | 8 | 3 | NR |
| 23 | Yui Miyamoto | Japan | 59.00 | 11 | 8 | |
| 25 | Amit Ivry | Israel | 59.02 | 11 | 9 | |
| 26 | Micha Kathrine Østergaard Jensen | Denmark | 59.06 | 11 | 2 | |
| 27 | Sara Isakovič | Slovenia | 59.10 | 11 | 1 | |
| 28 | Chantal Groot | Netherlands | 59.24 | 11 | 0 | |
| 29 | Caterina Giacchetti | Italy | 59.60 | 8 | 4 | |
| 30 | Emilia Pikkarainen | Finland | 59.69 | 8 | 6 | |
| 31 | Tao Li | Singapore | 59.73 | 11 | 3 | |
| 32 | Kateryna Zubkova | Ukraine | 59.77 | 9 | 0 | |
| 33 | Orsolya Tompa | Hungary | 59.85 | 8 | 8 | |
| 34 | Martina Van Berkel | Switzerland | 59.87 | 8 | 1 | NR |
| 35 | Birgit Koschischek | Austria | 59.93 | 9 | 9 | |
| 36 | Gabriella Fagundez | Sweden | 59.95 | 10 | 1 | |
| 37 | Kristina Tchernychev | Israel | 1:00.32 | 8 | 0 | |
| 38 | Anna Yevchak | Ukraine | 1:00.37 | 7 | 6 | |
| 39 | Anna Schoholeva | Cyprus | 1:00.42 | 7 | 5 | |
| 40 | Iryna Niafedava | Belarus | 1:00.46 | 8 | 9 | |
| 41 | Rita Medrano | Mexico | 1:00.47 | 7 | 1 | NR |
| 42 | Carolina Colorado Henao | Colombia | 1:00.50 | 8 | 7 | |
| 43 | Arianna Vanderpool-Wallace | Bahamas | 1:00.56 | 6 | 7 | NR |
| 44 | Laetitia Perez | Switzerland | 1:00.67 | 7 | 4 | |
| 45 | Sze Hang Yu | Hong Kong | 1:00.83 | 6 | 5 | |
| 46 | Iris Rosenberger | Turkey | 1:00.86 | 7 | 7 | |
| 47 | Mirela Olczak | Poland | 1:00.93 | 7 | 3 | |
| 48 | Kelly Shim Robinson | Hong Kong | 1:01.05 | 7 | 0 | |
| 49 | Lenka Jarosova | Czech Republic | 1:01.19 | 6 | 1 | |
| 50 | Fella Bennaceur | Algeria | 1:01.22 | 6 | 3 | NR |
| 51 | Katarina Listopadova | Slovakia | 1:01.24 | 7 | 2 | |
| 52 | Linda Laihorinne | Finland | 1:01.27 | 6 | 0 | |
| 53 | Maida Turnadzic | Bosnia and Herzegovina | 1:01.31 | 8 | 2 | |
| 54 | Alana Dillette | Bahamas | 1:01.51 | 6 | 4 | |
| 55 | Elimar Barrios | Venezuela | 1:01.95 | 7 | 8 | |
| 56 | Sofija Djelic | Slovenia | 1:02.09 | 7 | 9 | |
| 57 | Marellyn Lammert Liew | Malaysia | 1:02.14 | 6 | 2 | |
| 58 | Christine Mailliet | Luxembourg | 1:02.22 | 5 | 3 | |
| 59 | Yasemin Rosenberger | Turkey | 1:02.52 | 6 | 9 | |
| 60 | Kristina Bernice Lennox | Puerto Rico | 1:02.56 | 6 | 6 | |
| 61 | Aiste Dobrovolskaite | Lithuania | 1:02.60 | 5 | 5 | NR |
| 62 | Eliana Barrios | Venezuela | 1:02.92 | 5 | 4 | |
| 63 | Loren Yamile Bahamonde | Ecuador | 1:03.05 | 6 | 8 | |
| 64 | Farida Osman | Egypt | 1:03.21 | 5 | 6 | |
| 65 | Koh Ting Ting | Singapore | 1:03.25 | 5 | 7 | |
| 66 | Yumisleisy Morales Mendoza | Cuba | 1:03.33 | 5 | 9 | |
| 67 | Grite Apanaviciute | Lithuania | 1:03.38 | 5 | 2 | |
| 68 | Binta Zahra Diop | Senegal | 1:03.47 | 5 | 1 | |
| 69 | Ting Sheng-Yo | Chinese Taipei | 1:03.77 | 5 | 0 | |
| 70 | Marie Laura Meza | Costa Rica | 1:04.18 | 4 | 3 | |
| 71 | Ileana Murillo | El Salvador | 1:04.21 | 4 | 6 | |
| 72 | Maria Georgina Gandionco | Finland | 1:04.34 | 4 | 2 | |
| 72 | Ramond Sherazad | Morocco | 1:04.34 | 5 | 8 | |
| 74 | Laura Lucia Paz Chavez | Honduras | 1:04.45 | 4 | 0 | |
| 75 | Karrakchou Lilia | Morocco | 1:04.95 | 4 | 9 | |
| 76 | Chen Ting | Chinese Taipei | 1:05.06 | 4 | 5 | |
| 77 | Pooja Raghava Alva | India | 1:05.13 | 4 | 8 | |
| 78 | Davina Mangion | Malta | 1:05.41 | 3 | 5 | |
| 79 | Simona Muccioli | San Marino | 1:05.55 | 4 | 4 | |
| 80 | Karen Milenka Torrez Guzman | Bolivia | 1:05.64 | 3 | 3 | |
| 81 | Vandita Dhariyal | India | 1:05.80 | 2 | 2 | |
| 82 | Daniela Reyes Hinrichsen | Chile | 1:05.83 | 3 | 8 | |
| 83 | Dalia Torrez | Nicaragua | 1:05.93 | 3 | 4 | |
| 84 | Moira Fraser | Zimbabwe | 1:06.05 | 3 | 6 | |
| 85 | Ma Cheok Mei | Macau | 1:06.51 | 4 | 7 | |
| 86 | Sharon Paola Fajardo Sierra | Honduras | 1:07.07 | 4 | 1 | |
| 87 | Silvie Ketelaars | Netherlands Antilles | 1:07.42 | 3 | 7 | |
| 88 | Monica Bernardo | Mozambique | 1:07.52 | 3 | 0 | |
| 89 | Shalia Millum Gardarnar | Faroe Islands | 1:08.17 | 3 | 9 | |
| 90 | Razan Taha | Jordan | 1:08.28 | 2 | 5 | |
| 91 | Amina Meho | Lebanon | 1:08.39 | 3 | 2 | |
| 92 | Rachita Shah | Kenya | 1:08.89 | 2 | 9 | |
| 93 | Talisa Pace | Malta | 1:09.10 | 2 | 4 | |
| 94 | Li Chuen Cheong Estelle Anais | Mauritius | 1:09.51 | 2 | 6 | |
| 95 | Gessica Stagno | Mozambique | 1:09.67 | 2 | 1 | |
| 96 | Miniruwani Samarakoon | Sri Lanka | 1:09.99 | 2 | 8 | |
| 97 | Tieri Erasito | Fiji | 1:11.63 | 2 | 0 | |
| 98 | Ashley Bransford | Aruba | 1:13.51 | 2 | 3 | |
| 99 | Adele Rova | Fiji | 1:14.04 | 1 | 5 | |
| 100 | Tin Hon Ko Adeline Mei-Li | Mauritius | 1:14.08 | 2 | 7 | |
| 101 | Gantumur Oyungerel | Mongolia | 1:14.99 | 1 | 4 | |
| 102 | Aelia Mehdi | Pakistan | 1:25.88 | 1 | 3 | |
Key: CR = Championship record, NR = National record

### Semifinals

| Rank | Name | Nationality | Time | Heat | Lane | Notes |
| 1 | Sarah Sjöström | Sweden | 56.44 | 2 | 4 | WR |
| 2 | Jessicah Schipper | Australia | 57.08 | 2 | 5 | |
| 3 | Dana Vollmer | United States | 57.19 | 1 | 4 | |
| 4 | Ingvild Snildal | Norway | 57.20 | 2 | 6 | NR |
| 5 | Jiao Liuyang | China | 57.25 | 1 | 2 | |
| 6 | Aurore Mongel | France | 57.39 | 1 | 6 | NR |
| 7 | Gabriella Silva | Brazil | 57.42 | 1 | 8 | SA |
| 8 | Marleen Veldhuis | Netherlands | 57.56 | 1 | 7 | |
| 8 | Yafei Zhou | China | 57.56 | 1 | 5 | |
| 10 | Christine Magnuson | United States | 57.59 | 2 | 3 | |
| 11 | Jeanette Ottesen | Denmark | 57.65 | 1 | 3 | |
| 12 | Daynara de Paula | Brazil | 57.68 | 1 | 1 | |
| 13 | Felicity Galvez | Australia | 57.71 | 2 | 2 | |
| 14 | Annika Mehlhorn | Germany | 57.90 | 2 | 7 | NR |
| 15 | Yuka Kato | Japan | 57.95 | 2 | 8 | |
| 16 | Ellen Gandy | Great Britain | 58.25 | 2 | 1 | |

#### Swim-off

| Rank | Name | Nationality | Time | Lane | Notes |
| 1 | Marleen Veldhuis | Netherlands | 57.38 | 4 | |
| 2 | Yafei Zhou | China | 57.62 | 5 | |

### Finals

| Rank | Name | Nationality | Time | Lane | Notes |
| | Sarah Sjöström | Sweden | 56.06 | 4 | WR |
| | Jessicah Schipper | Australia | 56.23 | 5 | OC |
| | Jiao Liuyang | China | 56.86 | 2 | AS |
| 4 | Aurore Mongel | France | 56.89 | 7 | NR |
| 5 | Gabriella Silva | Brazil | 56.94 | 1 | =AM |
| 5 | Dana Vollmer | United States | 56.94 | 3 | =AM |
| 7 | Ingvild Snildal | Norway | 56.96 | 6 | NR |
| 8 | Marleen Veldhuis | Netherlands | 57.79 | 8 | |
Note: The Dutch Record in this event is Inge de Bruijn's former World Record (56.61), which may help to explain why Veldhuis was the only finalist not to set a National Record (NR).