Swimming at the 2003 World Aquatics Championships – Women's 50 metre butterfly
# Swimming at the 2003 World Aquatics Championships – Women's 50 metre butterfly

The Women's 50m Butterfly event at the 10th FINA World Aquatics Championships swam on July 25 – 26, 2003 in Barcelona, Spain. Preliminary and Semifinal heats swam on July 25, with the Final swum on July 26.

At the start of the event, the World (WR) and Championship (CR) records were:

* WR: 25.57 swum by Anna-Karin Kammerling (Sweden) on July 30, 2002 in Berlin, Germany.
* CR: 25.90 swum by Inge de Bruijn (Netherlands) on July 26, 2001 in Fukuoka, Japan

## Results

### Final

| Place | Swimmer | Nation | Time | Notes |
| - | - | - | - | - |
| 1 | Inge de Bruijn | Netherlands | 25.84 | CR |
| 2 | Jenny Thompson | USA | 26.00 | NR |
| 3 | Anna-Karin Kammerling | Sweden | 26.06 | |
| 4 | Yafei Zhou | China | 26.85 | |
| 5 | Chantal Groot | Netherlands | 26.92 | |
| 6 | Vered Borochovsky | Israel | 26.98 | |
| 7 | Nataliya Khudyakova | Ukraine | 27.10 | |
| 8 | Ángela San Juan | Spain | 27.24 | |

### Semifinals

| Rank | Heat + Lane | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | S2 L4 | Inge de Bruijn | Netherlands | 25.94 | q |
| 2 | S1 L5 | Yafei Zhou | China | 26.73 | q |
| 2 | S2 L5 | Anna-Karin Kammerling | Sweden | 26.73 | q |
| 4 | S1 L3 | Chantal Groot | Netherlands | 26.82 | q |
| 5 | S2 L3 | Vered Borochovsky | Israel | 26.97 | q |
| 6 | S1 L2 | Nataliya Khudyakova | Ukraine | 27.10 | q |
| 7 | S1 L4 | Jenny Thompson | USA | 27.16 | q |
| 8 | S1 L7 | Ángela San Juan | Spain | 27.23 | q |
| 9 | S2 L6 | Mary DeScenza | USA | 27.25 | |
| 10 | S1 L8 | Fabienne Dufour | Belgium | 27.38 | |
| 10 | S2 L2 | Junko Onishi | Japan | 27.38 | |
| 12 | S2 L1 | Fabienne Nadarajah | Austria | 27.43 | |
| 13 | S1 L6 | Tine Bossuyt | Belgium | 27.46 | |
| 14 | S1 L1 | Libby Lenton | Australia | 27.48 | |
| 15 | S2 L8 | Gabriella Fagundez | Sweden | 27.66 | |
| 16 | S2 L7 | Triin Aljand | Estonia | 27.67 | |

### Preliminaries

| Rank | Heat+Lane | Swimmer | Nation | Time | Notes |
| - | - | - | - | - | - |
| 1 | H7 L4 | Inge de Bruijn | Netherlands | 26.33 | q |
| 2 | H8 L5 | Jenny Thompson | United States | 27.01 | q |
| 3 | H8 L4 | Anna-Karin Kammerling | Sweden | 27.16 | q |
| 4 | H8 L6 | Yafei Zhou | China | 27.33 | q |
| 5 | H6 L3 | Vered Borochovsky | Israel | 27.37 | q |
| 6 | H6 L4 | Chantal Groot | Netherlands | 27.40 | q |
| 6 | H7 L8 | Mary DeScenza | United States | 27.40 | q |
| 8 | H7 L6 | Tine Bossuyt | Belgium | 27.46 | q |
| 9 | H6 L6 | Junko Onishi | Japan | 27.53 | q |
| 9 | H7 L1 | Nataliya Khudyakova | Ukraine | 27.53 | q |
| 11 | H1 L4 | Triin Aljand | Estonia | 27.54 | q |
| 12 | H7 L5 | Ángela San Juan | Spain | 27.56 | q |
| 13 | H6 L5 | Fabienne Nadarajah | Austria | 27.64 | q |
| 14 | H8 L3 | Libby Lenton | Australia | 27.65 | q |
| 15 | H8 L7 | Gabriella Fagundez | Sweden | 27.67 | q |
| 16 | H7 L2 | Fabienne Dufour | Belgium | 27.73 | q |
| 17 | H7 L3 | Rosalind Brett | Great Britain | 27.81 | |
| 18 | H7 L7 | Melanie Houghton | Australia | 27.96 | |
| 19 | H8 L2 | Judith Draxler | Austria | 28.00 | |
| 20 | H6 L7 | Maj Hillesund | Norway | 28.02 | |
| 21 | H6 L2 | Mandy Loots | South Africa | 28.08 | |
| 22 | H8 L8 | Jennifer Carroll | Canada | 28.25 | |
| 23 | H8 L1 | Jennifer Button | Canada | 28.27 | |
| 24 | H5 L4 | Sara Oliveira | Portugal | 28.44 | |
| 25 | H5 L6 | Kolbrún Ýr Kristjánsdóttir | Iceland | 28.61 | |
| 26 | H5 L3 | Hang Yu Sze | Hong Kong | 28.69 | |
| 27 | H5 L7 | Marjorie Sagne | Switzerland | 28.73 | |
| 28 | H4 L3 | Sharntelle McLean | Trinidad and Tobago | 28.81 | |
| 29 | H5 L8 | Maria Rodriguez | Venezuela | 29.05 | |
| 30 | H5 L5 | Danijela Djikanovic | FR Yugoslavia | 29.20 | |
| 31 | H5 L1 | Flora Kong | Hong Kong | 29.30 | |
| 32 | H6 L8 | Julie Douglas | Ireland | 29.34 | |
| 33 | H4 L2 | Yamilé Bahamonde | Ecuador | 29.35 | |
| 34 | H4 L5 | Ivi Monteiro | Brazil | 29.36 | |
| 35 | H4 L7 | Larissa Komt | Peru | 29.82 | |
| 36 | H4 L8 | Sabria Dahane | Algeria | 29.99 | |
| 37 | H4 L4 | Irina Shlemova | Uzbekistan | 30.12 | |
| 38 | H4 L6 | Leonore Kelleher | Ireland | 30.20 | |
| 39 | H4 L1 | Angela Galea | Malta | 30.25 | |
| 40 | H3 L6 | Geraldine Arce | Nicaragua | 30.63 | |
| 41 | H3 L4 | Cheok Mei Ma | Macau | 31.11 | |
| 42 | H3 L5 | Natasha George | Saint Lucia | 31.27 | |
| 43 | H1 L5 | Nicole Hayes | Palau | 31.36 | |
| 44 | H3 L7 | Éliane Droubry | Ivory Coast | 31.57 | |
| 45 | H3 L1 | Binta Zahra Diop | Senegal | 31.60 | |
| 46 | H3 L2 | Roshendra Vrolijk | Aruba | 31.72 | |
| 47 | H3 L8 | Eva Donde | Kenya | 31.99 | |
| 48 | H2 L3 | Krystle Babao | Papua New Guinea | 32.06 | |
| 49 | H2 L6 | Jakie Wellman | Zambia | 32.40 | |
| 50 | H1 L3 | Tracy Ann Route | Federated States of Micronesia | 32.44 | |
| 51 | H2 L5 | Kiran Khan | Pakistan | 32.61 | |
| 52 | H2 L4 | Genevieve Meledje Lasm Quissoh | Ivory Coast | 33.68 | |
| 53 | H2 L1 | Monika Bakale | Republic of the Congo | 34.74 | |
| 54 | H2 L7 | Joana Gjini | Albania | 34.83 | |
| 55 | H2 L2 | Nayana Shakya | Nepal | 36.70 | |
| 56 | H1 L6 | Amber Yobech | Palau | 38.27 | |
| - | - | Joscelin Yeo | Singapore | DNS | |
| - | - | Alessandra Cappa | Italy | DNS | |
| - | - | Elize Taua | Samoa | DNS | |
