# Swimming at the 2024 Summer Olympics – Women's 4 × 100 metre medley relay

The women's 4 × 100 metre medley relay event at the 2024 Summer Olympics was held on 3 and 4 August 2024 at Paris La Défense Arena, which was converted to a swimming pool for the swimming events. Since an Olympic size swimming pool is 50 metres long, each swimmer had to swim two lengths of the pool with their respective stroke.

## Records

Prior to this competition, the existing world and Olympic records were as follows:
| World record | United States (USA)Regan Smith (57.57)Lilly King (1:04.81)Kelsi Dahlia (56.16)Simone Manuel (51.86) | 3:50.40 | Gwangju, South Korea | 28 July 2019 |
| Olympic record | Australia (AUS)Kaylee McKeown (58.01)Chelsea Hodges (1:05.57)Emma McKeon (55.91)Cate Campbell (52.11) | 3:51.60 | Tokyo, Japan | 1 August 2021 |
The following record was established during the competition:
| Date | Round | Name | Nationality | Time | Record |
| 4 August | Final | Regan Smith (57.28) OR Lilly King (1:04.90) Gretchen Walsh (55.03) Torri Huske (52.42) | United States | 3:49.63 | WR |

## Qualification

For the relays, a maximum of 16 qualifying teams in each event must be permitted to accumulate a total of 112 relay teams; each NOC may enter only one team. The top three teams in each relay race at the 2023 World Aquatics Championships in Fukuoka, Japan will directly book a slot for their corresponding event at the Olympics, while the remaining thirteen vying for qualification per relay race must attain their best time from the heats and finals at the combined 2023 and 2024 meet in Doha.

## Competition format

The competition consists of two rounds: heats and a final. The teams with the best 8 times in the heats advance to the final. Swim-offs are used as necessary to break ties for advancement to the next round (final).

## Schedule

All times are Central European Summer Time (UTC+2)
| Date | Time | Round |
| 3 August 2024 | 15:52 | Heats |
| 4 August 2024 | 22:32 | Final |

## Results
### Heats

Results :
| Rank | Heat | Lane | Swimmer | Time | Notes |
| 1 | 1 | 4 | Australia Iona Anderson (58.67) Ella Ramsay (1:06.79) Alexandria Perkins (56.59) Meg Harris (52.76) | 3:54.81 | Q |
| 2 | 2 | 5 | Canada Ingrid Wilm (59.42) Sophie Angus (1:06.07) Mary-Sophie Harvey (57.68) Penny Oleksiak (52.93) | 3:56.10 | Q |
| 3 | 1 | 5 | China Wang Xue'er (59.75) Tang Qianting (1:05.74) Yu Yiting (56.60) Wu Qingfeng (54.25) | 3:56.34 | Q |
| 4 | 2 | 4 | United States Katharine Berkoff (58.98) Emma Weber (1:07.39) Alex Shackell (57.32) Kate Douglass (52.71) | 3:56.40 | Q |
| 5 | 2 | 6 | Japan Rio Shirai (1:00.91) Satomi Suzuki (1:05.52) Mizuki Hirai (56.32) Rikako Ikee (53.77) | 3:56.52 | Q |
| 6 | 2 | 3 | Sweden Hanna Rosvall (1:00.16) Sophie Hansson (1:07.24) Louise Hansson (56.62) Sarah Sjöström (53.31) | 3:57.33 | Q |
| 7 | 1 | 6 | France Emma Terebo (59.16) Charlotte Bonnet (1:07.40) Marie Wattel (57.19) Mary-Ambre Moluh (53.65) | 3:57.40 | Q |
| 8 | 1 | 3 | Netherlands Maaike de Waard (1:00.19) Tes Schouten (1:07.88) Tessa Giele (57.01) Marrit Steenbergen (52.40) | 3:57.48 | Q |
| 9 | 1 | 7 | Germany Laura Riedemann (1:01.05) Anna Elendt (1:05.92) Angelina Köhler (56.74) Nina Holt (54.41) | 3:58.12 | |
| 10 | 2 | 2 | Great Britain Kathleen Dawson (1:00.67) Angharad Evans (1:05.40) Keanna Macinnes (58.72) Freya Anderson (53.55) | 3:58.34 | |
| 11 | 2 | 1 | Ireland Danielle Hill (1:00.84) Mona McSharry (1:05.38) Ellen Walshe (58.01) Grace Davison (55.89) | 4:00.12 | NR |
| 12 | 1 | 2 | Poland Adela Piskorska (1:00.96) Dominika Sztandera (1:07.39) Paulina Peda (58.66) Kornelia Fiedkiewicz (53.93) | 4:00.94 | |
| 13 | 1 | 1 | Hong Kong Hoi Shun Stephanie Au (1:01.49) Siobhan Haughey (1:07.01) Cheuk Tung Natalie Kan (59.76) Hoi Lam Tam (55.30) | 4:03.56 | |
| 14 | 2 | 8 | Singapore Levenia Sim (1:02.30) En Yi Letitia Sim (1:06.76) Quah Jing Wen (59.94) Gan Ching Hwee (56.58) | 4:05.58 | |
| | 1 | 8 | Denmark Schastine Tabor Thea Blomsterberg Martine Damborg Elisabeth Sabroe Ebbesen | DSQ | |
| | 2 | 7 | Italy Margherita Panziera Benedetta Pilato Viola Scotto Di Carlo Sofia Morini | DSQ | |

### Final

Results :
| Rank | Lane | Team | Time | Notes |
| | 6 | United States Regan Smith (57.28) OR Lilly King (1:04.90) Gretchen Walsh (55.03) Torri Huske (52.42) | 3:49.63 | WR |
| | 4 | Australia Kaylee McKeown (57.72) Jenna Strauch (1:07.31) Emma McKeon (56.25) Mollie O'Callaghan (51.83) | 3:53.11 | |
| | 3 | China Wan Letian (59.81) Tang Qianting (1:05.79) Zhang Yufei (55.52) Yang Junxuan (52.11) | 3:53.23 | |
| 4 | 5 | Canada Kylie Masse (58.29) Sophie Angus (1:06.54) Maggie Mac Neil (55.79) Summer McIntosh (53.29) | 3:53.91 | |
| 5 | 2 | Japan Rio Shirai (1:01.24) Satomi Suzuki (1:05.08) Mizuki Hirai (56.27) Rikako Ikee (53.58) | 3:56.17 | |
| 6 | 1 | France Emma Terebo (59.00) Charlotte Bonnet (1:06.85) Marie Wattel (57.29) Beryl Gastaldello (53.15) | 3:56.29 | NR |
| 7 | 7 | Sweden Hanna Rosvall (1:00.38) Sophie Hansson (1:06.24) Louise Hansson (56.95) Sarah Sjöström (53.35) | 3:56.92 | |
| 8 | 8 | Netherlands Maaike de Waard (59.91) Tes Schouten (1:08.55) Tessa Giele (57.51) Marrit Steenbergen (53.55) | 3:59.52 | |