# Swimming at the 2024 World Aquatics Championships – Women's 4 × 100 metre medley relay

The Women's 4 × 100 metre medley relay competition at the 2024 World Aquatics Championships was held on 18 February 2024.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | United States | 3:50.40 | Gwangju, South Korea | 28 July 2019 |
| Competition record | United States | 3:50.40 | Gwangju, South Korea | 28 July 2019 |

## Results
### Heats

The heats were held at 10:25.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 3 | 5 | Canada | Ingrid Wilm (59.77) Sydney Pickrem (1:06.14) Rebecca Smith (57.81) Katerine Savard (54.91) | 3:58.63 | Q |
| 2 | 3 | 3 | Sweden | Hanna Rosvall (1:01.23) Sophie Hansson (1:07.23) Louise Hansson (56.84) Michelle Coleman (54.05) | 3:59.35 | Q |
| 3 | 2 | 4 | Australia | Jaclyn Barclay (1:00.27) Abbey Harkin (1:08.15) Alexandria Perkins (57.21) Brianna Throssell (54.46) | 4:00.09 | Q |
| 4 | 2 | 3 | Netherlands | Kira Toussaint (1:00.82) Tes Schouten (1:08.36) Maaike de Waard (58.03) Kim Busch (54.88) | 4:02.09 | Q |
| 5 | 2 | 5 | China | Sun Mingxia (1:02.13) Yang Chang (1:06.50) Yu Yiting (57.84) Ai Yanhan (55.75) | 4:02.22 | Q |
| 6 | 3 | 7 | Hong Kong | Stephanie Au (1:00.98) Siobhan Haughey (1:07.05) Natalie Kan (59.29) Camille Cheng (55.02) | 4:02.34 | Q |
| 7 | 3 | 2 | Italy | Francesca Pasquino (1:01.37) Arianna Castiglioni (1:06.75) Costanza Cocconcelli (58.35) Chiara Tarantino (56.15) | 4:02.62 | Q |
| 8 | 2 | 6 | Poland | Adela Piskorska (1:01.16) Dominika Sztandera (1:07.76) Paulina Peda (58.42) Kornelia Fiedkiewicz (55.29) | 4:02.63 | Q |
| 9 | 3 | 8 | Singapore | Levenia Sim (1:02.58) Letitia Sim (1:06.41) Quah Jing Wen (58.89) Quah Ting Wen (55.00) | 4:02.88 | NR |
| 10 | 3 | 1 | South Africa | Milla Drakopoulos (1:02.48) Lara van Niekerk (1:07.50) Erin Gallagher (57.99) Emma Chelius (55.57) | 4:03.54 | |
| 11 | 2 | 2 | Spain | Carmen Weiler (1:01.31) Jimena Ruiz (1:08.67) Paula Juste (59.09) María Daza (54.94) | 4:04.01 | |
| 11 | 2 | 7 | Greece | Theodora Drakou (1:01.47) Eleni Kontogeorgou (1:09.01) Anna Ntountounaki (57.79) Maria Thaleia Drasidou (55.74) | 4:04.01 | NR |
| 13 | 1 | 4 | Hungary | Lora Komoróczy (1:01.83) Eszter Békési (1:09.43) Panna Ugrai (58.93) Petra Senánszky (55.06) | 4:05.25 | |
| 14 | 2 | 8 | Portugal | Camila Rebelo (1:01.13) Ana Rodrigues (1:08.89) Mariana Pacheco (59.00) Francisca Soares (56.24) | 4:05.26 | |
| 15 | 1 | 3 | Slovenia | Janja Šegel (1:02.02) Tara Vovk (1:10.49) Hana Sekuti (1:00.40) Neža Klančar (54.56) | 4:07.47 | NR |
| 16 | 2 | 1 | Mexico | Tayde Sansores (1:03.13) Melissa Rodríguez (1:08.35) María José Mata Cocco (1:00.53) Tayde Revilak (56.29) | 4:08.30 | |
| 17 | 3 | 0 | Philippines | Teia Salvino (1:03.76) Thanya Dela Cruz (1:10.13) Jasmine Alkhaldi (1:02.78) Kayla Sanchez (55.28) | 4:11.95 | |
| 18 | 2 | 0 | Kazakhstan | Xeniya Ignatova (1:02.04) Adelaida Pchelintseva (1:11.98) Sofia Spodarenko (1:00.32) Diana Taszhanova (59.58) | 4:13.92 | |
| 19 | 3 | 9 | Chinese Taipei | Wu Yi-en (1:07.47) Lin Pei-wun (1:11.36) Applejean Gwinn (1:06.13) Huang Mei-chien (56.98) | 4:21.94 | |
| | 1 | 5 | Slovakia | Did not start | Did not start | Did not start |
| | 2 | 9 | Lithuania | Did not start | Did not start | Did not start |
| | 3 | 4 | United States | Did not start | Did not start | Did not start |
| | 3 | 6 | South Korea | Song Jae-yun (1:02.11) Moon Su-a (1:10.21) Kim Seo-yeong (58.11) Hur Yeon-kyung | Disqualified | Disqualified |

### Final

The final was held at 20:55.
| Rank | Lane | Nation | Swimmers | Time |
| | 3 | Australia | Iona Anderson (59.20) Abbey Harkin (1:07.21) Brianna Throssell (56.86) Shayna Jack (52.71) | 3:55.98 |
| | 5 | Sweden | Louise Hansson (59.93) Sophie Hansson (1:06.18) Sarah Sjöström (56.11) Michelle Coleman (54.13) | 3:56.35 |
| | 4 | Canada | Ingrid Wilm (58.95) Sophie Angus (1:06.24) Rebecca Smith (58.28) Taylor Ruck (52.96) | 3:56.43 |
| 4 | 2 | China | Sun Mingxia (1:02.20) Tang Qianting (1:05.15) Yu Yiting (57.16) Ai Yanhan (54.65) | 3:59.16 |
| 5 | 6 | Netherlands | Kira Toussaint (1:00.26) Tes Schouten (1:07.53) Maaike de Waard (58.16) Kim Busch (54.29) | 4:00.24 |
| 6 | 1 | Italy | Francesca Pasquino (1:01.03) Benedetta Pilato (1:06.56) Costanza Cocconcelli (58.12) Chiara Tarantino (54.63) | 4:00.34 |
| 7 | 8 | Poland | Adela Piskorska (1:01.24) Dominika Sztandera (1:07.46) Paulina Peda (58.49) Kornelia Fiedkiewicz (54.54) | 4:01.73 |
| 8 | 7 | Hong Kong | Stephanie Au (1:01.29) Siobhan Haughey (1:06.82) Natalie Kan (59.95) Camille Cheng (55.09) | 4:03.15 |