# 2018 FINA World Swimming Championships (25 m) – Women's 4 × 50 metre medley relay

The women's 4 × 50 metre medley relay competition of the 2018 FINA World Swimming Championships (25 m) was held on 12 December 2018.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Nation | Time | Location | Date |
| World record | United States | 1:43.27 | Windsor, Canada | 7 December 2016 |
| Championship record | United States | 1:43.27 | Windsor, Canada | 7 December 2016 |

## Results
### Heats

The heats were started at 09:30.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 2 | 2 | United States | Kathleen Baker (26.89) Katie Meili (29.26) Kendyl Stewart (25.22) Erika Brown (23.55) | 1:44.92 | Q |
| 2 | 1 | 5 | China | Fu Yuanhui (26.66) Suo Ran (30.31) Wang Yichun (25.10) Wu Yue (23.46) | 1:45.53 | Q |
| 3 | 2 | 8 | Japan | Miyuki Takemura (26.39) Miho Teramura (30.10) Ai Soma (25.51) Aya Sato (24.02) | 1:46.02 | Q |
| 4 | 1 | 6 | Czech Republic | Simona Kubová (26.59) Petra Chocová (30.15) Lucie Svěcená (25.79) Anika Apostalon (23.78) | 1:46.31 | Q |
| 5 | 2 | 4 | Netherlands | Maaike de Waard (26.84) Kim Busch (30.76) Ranomi Kromowidjojo (25.13) Femke Heemskerk (24.26) | 1:46.99 | Q |
| 6 | 2 | 3 | Australia | Minna Atherton (26.92) Jessica Hansen (30.17) Holly Barratt (25.84) Carla Buchanan (24.56) | 1:47.49 | Q |
| 7 | 2 | 5 | Russia | Anastasia Fesikova (27.30) Maria Temnikova (30.39) Arina Surkova (25.47) Daria Kartashova (24.57) | 1:47.73 | Q |
| 8 | 1 | 4 | Italy | Elena Di Liddo (27.08) Arianna Castiglioni (29.80) Ilaria Bianchi (26.14) Margherita Panziera (24.79) | 1:47.81 | Q |
| 9 | 2 | 7 | Germany | Laura Riedemann (27.22) Jessica Steiger (30.53) Aliena Schmidtke (25.65) Marie Pietruschka (24.72) | 1:48.12 | |
| 10 | 2 | 1 | Canada | Ingrid Wilm (27.72) Sophie Angus (30.50) Haley Black (25.14) Aela Janvier (26.20) | 1:49.56 | |
| 11 | 1 | 1 | Switzerland | Seraina Sturzenegger (27.97) Lisa Mamie (30.85) Svenja Stoffel (26.33) Alexandra Touretski (24.58) | 1:49.73 | |
| 12 | 1 | 7 | Slovakia | Karolina Hájková (27.63) Andrea Podmaníková (30.76) Tamara Potocká (26.81) Sabína Kupčová (26.04) | 1:51.24 | |
| 13 | 2 | 6 | Turkey | Ekaterina Avramova (28.00) Viktoriya Zeynep Güneş (31.25) Aleyna Özkan (27.00) Selen Özbilen (25.00) | 1:51.25 | |
| 14 | 1 | 3 | Hong Kong | Stephanie Au (27.86) Lam Hoi Kiu (31.94) Chan Kin Lok (27.70) Sze Hang Yu (24.49) | 1:51.99 | |
| 15 | 1 | 2 | New Zealand | Emma Godwin (28.06) Ciara Smith (31.96) Vanessa Ouwehand (27.37) Rebecca Moynihan (25.06) | 1:52.45 | |
| 16 | 1 | 8 | Chinese Taipei | Wang Wan-chen (30.19) Lin Pei-wun (31.84) Huang Mei-chien (26.98) Chen Szu-an (26.89) | 1:55.90 | |

### Final

The final was held at 19:00.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | United States | Olivia Smoliga (25.97) Katie Meili (29.29) Kelsi Dahlia (24.02) Mallory Comerford (23.10) | 1:42.38 | WR |
| | 5 | China | Fu Yuanhui (26.20) Suo Ran (29.63) Wang Yichun (24.84) Wu Yue (23.64) | 1:44.31 | |
| | 2 | Netherlands | Maaike de Waard (26.46) Kim Busch (30.73) Ranomi Kromowidjojo (24.21) Femke Heemskerk (23.17) | 1:44.57 | |
| 4 | 3 | Japan | Miyuki Takemura (26.14) Miho Teramura (29.50) Ai Soma (25.28) Aya Sato (23.98) | 1:44.90 | |
| 5 | 7 | Australia | Minna Atherton (26.44) Jessica Hansen (29.70) Emily Seebohm (25.68) Holly Barratt (23.97) | 1:45.79 | |
| 6 | 1 | Russia | Maria Kameneva (26.51) Maria Temnikova (30.31) Arina Surkova (25.23) Rozaliya Nasretdinova (23.93) | 1:45.98 | |
| 7 | 6 | Czech Republic | Simona Kubová (26.58) Petra Chocová (29.90) Lucie Svěcená (25.86) Anika Apostalon (23.83) | 1:46.17 | |
| 8 | 8 | Italy | Carlotta Zofkova (27.38) Arianna Castiglioni (29.48) Elena Di Liddo (25.10) Margherita Panziera (24.48) | 1:46.44 | |