# Swimming at the 2003 World Aquatics Championships – Women's 4 × 100 metre medley relay

The Women's 4x100m Medley Relay event at the 10th FINA World Aquatics Championships swam 26 July 2003 in Barcelona, Spain. Preliminary heats swam in the morning session, with the top-8 finishers advancing to swim again in the Final that evening.
At the start of the event, the World (WR) and Championship (CR) records were:
* WR: 3:58.30 swum by the USA on September 23, 2000 in Sydney, Australia.
* CR: 4:01.50 swum by Australia on July 29, 2001 in Fukuoka, Japan.

## Results
### Final

| Rank | Nation | Swimmers | Time | Notes |
| 1 | China | Shu Zhan, Xuejuan Luo, Yafei Zhou, Yu Yang | 3:59.89 | CR |
| 2 | USA | Natalie Coughlin, Amanda Beard, Jenny Thompson, Lindsay Benko | 4:00.83 | |
| 3 | Australia | Giaan Rooney, Leisel Jones, Jessicah Schipper, Jodie Henry | 4:01.37 | |
| 4 | Germany | Antje Buschschulte, Sarah Poewe, Annika Mehlhorn, Sandra Völker | 4:02.01 | |
| 5 | Japan | Mai Nakamura, Masami Tanaka, Yuko Nakanishi, Tomoko Nagai | 4:06.25 | |
| 6 | Netherlands | Hinkelien Schreuder, Madelon Baans, Chantal Groot, Marleen Veldhuis | 4:07.73 | |
| 7 | Sweden | Susannah Moonan, Emma Igelström, Johanna Sjöberg, Josefin Lillhage | 4:08.39 | |
| 8 | Great Britain | Katy Sexton, Jaime King, Alexandra Savage, Karen Legg | 4:10.69 | |

### Preliminaries

| Rank | Heat/Lane | Nation | Swimmers | Time | Notes |
| 1 | H1 L4 | United States | Haley Cope, Tara Kirk Mary DeScenza, Lindsay Benko | 4:04.06 | q |
| 2 | H3 L5 | Germany | Antje Buschschulte, Vipa Bernhardt Annika Mehlhorn, Petra Dallmann | 4:04.58 | q |
| 3 | H3 L4 | China | Shu Zhan, Xuejuan Luo Yafei Zhou, Yu Yang | 4:04.95 | q |
| 4 | H2 L4 | Australia | Giaan Rooney, Leisel Jones Jessicah Schipper, Jodie Henry | 4:05.31 | q |
| 5 | H3 L2 | Netherlands | Hinkelien Schreuder, Madelon Baans Chantal Groot, Marleen Veldhuis | 4:06.32 | q |
| 6 | H2 L3 | Japan | Reiko Nakamura, Masami Tanaka Yuko Nakanishi, Tomoko Nagai | 4:06.38 | q |
| 7 | H2 L5 | Great Britain | Melanie Marshall, Jaime King Georgina Lee, Karen Legg | 4:06.99 | q |
| 8 | H3 L6 | Sweden | Susannah Moonan, Emma Igelström Johanna Sjöberg, Josefin Lillhage | 4:07.82 | q |
| 9 | H1 L3 | Ukraine | Iryna Amshennikova, Yuliya Pidslina Nataliya Khudyakova, Olga Mukomol | 4:10.29 | |
| 10 | H1 L6 | Italy | Alessandra Cappa, Sara Farina Francesca Segat, Cristina Chiuso | 4:10.41 | |
| 11 | H1 L5 | South Africa | Melissa Corfe, Ingrid Haiden Mandy Loots, Lauren Roets | 4:11.95 | |
| 12 | H2 L2 | Switzerland | Dominique Diezi, Ramona Pedretti Nicole Zahnd, Marjorie Sagne | 4:16.87 | |
| 13 | H1 L2 | Hong Kong | Sherry Tsai, Ka Lei Liu Hang Yu Sze, Jennifer Ng | 4:21.01 | |
| 14 | H2 L7 | Brazil | Talita Ribeiro, Patrícia Comini Ivi Monteiro, Flávia Delaroli | 4:21.87 | |
| 15 | H1 L7 | Iceland | Anja Rikey Jakobsdottir, Íris Edda Heimisdóttir Kolbrún Ýr Kristjánsdóttir, Lára Hrund Bjargardóttir | 4:23.02 | |
| 16 | H3 L1 | India | Shikha Tandon, Sivranjani Vaidyanathan Richa Mishra, Ambica Iyengar | 4:47.73 | |
| - | H3 L3 | Canada | Erin Gammel, Rhiannon Leier Jen Button, Laura Nicholls | DQ | |
| - | H3 L7 | Greece | Eirini Karastergiou, Aikaterini Sarakatsani Zampia Melachroinou, Nery-Mantey Niangkouara | DQ | |
| - | - | Russia | - | DNS | |