# Swimming at the 2023 World Aquatics Championships – Mixed 4 × 100 metre medley relay

The mixed 4 × 100 metre medley relay competition at the 2023 World Aquatics Championships was held on 26 July 2023.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Great Britain | 3:37.58 | Tokyo, Japan | 31 July 2021 |
| Competition record | United States | 3:38.56 | Budapest, Hungary | 26 July 2017 |

## Results
### Heats

The heats were held at 11:56.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 5 | 4 | United States | Katharine Berkoff (59.12) Josh Matheny (58.45) Dare Rose (50.50) Abbey Weitzeil (52.40) | 3:40.47 | Q |
| 2 | 4 | 4 | Australia | Bradley Woodward (53.63) Samuel Williamson (58.88) Emma McKeon (56.70) Shayna Jack (51.66) | 3:40.87 | Q |
| 3 | 5 | 5 | Netherlands | Maaike de Waard (1:00.07) Arno Kamminga (58.72) Nyls Korstanje (50.53) Marrit Steenbergen (52.13) | 3:41.45 | Q |
| 4 | 4 | 3 | China | Xu Jiayu (52.68) Yan Zibei (59.00) Wang Yichun (57.46) Wu Qingfeng (53.35) | 3:42.49 | Q |
| 5 | 4 | 5 | Great Britain | Medi Harris (59.71) James Wilby (59.34) Jacob Peters (51.03) Anna Hopkin (53.39) | 3:43.47 | Q |
| 6 | 5 | 6 | Canada | Ingrid Wilm (59.68) James Dergousoff (1:00.24) Margaret MacNeil (56.74) Ruslan Gaziev (47.66) | 3:44.32 | Q |
| 7 | 4 | 6 | Japan | Ryosuke Irie (53.63) Ippei Watanabe (59.48) Ai Soma (57.73) Rikako Ikee (53.95) | 3:44.79 | Q |
| 8 | 4 | 2 | Germany | Ole Braunschweig (53.66) Lucas Matzerath (58.97) Angelina Köhler (56.65) Lisa-Marie Finger (56.06) | 3:45.34 | Q |
| 9 | 4 | 8 | Sweden | Hanna Rosvall (1:00.37) Erik Persson (1:00.12) Louise Hansson (57.05) Björn Seeliger (48.31) | 3:45.85 | |
| 10 | 5 | 7 | France | Pauline Mahieu (1:00.45) Clement Bidard (1:00.11) Stanislas Huille (51.69) Beryl Gastaldello (52.82) | 3:46.07 | |
| 11 | 5 | 3 | Italy | Lorenzo Mora (54.69) Federico Poggio (58.87) Ilaria Bianchi (58.39) Costanza Cocconcelli (54.13) | 3:46.08 | |
| 12 | 5 | 2 | Poland | Ksawery Masiuk (53.88) Dominika Sztandera (1:06.61) Adrian Jaskiewicz (51.35) Kornelia Fiedkiewicz (54.45) | 3:46.29 | |
| 13 | 3 | 5 | South Korea | Lee Eun-ji (1:00.41) Choi Dong-yeol (59.50) Kim Young-beom (52.25) Hur Yeon-kyung (54.93) | 3:47.09 | |
| 14 | 4 | 7 | Greece | Apostolos Christou (52.99) Arkadios Aspougalis (1:01.30) Anna Ntountounaki (57.40) Maria Drasidou (55.88) | 3:47.57 | |
| 15 | 4 | 1 | Israel | Anastasia Gorbenko (1:00.13) Ron Polonsky (1:00.17) Tomer Frankel (52.15) Daria Golovaty (55.31) | 3:47.76 | |
| 16 | 5 | 1 | Brazil | Guilherme Basseto (54.28) Jhennifer Conceição (1:08.07) Kayky Mota (51.51) Stephanie Balduccini (54.14) | 3:48.00 | |
| 17 | 3 | 3 | New Zealand | Helena Gasson (1:00.68) Josh Gilbert (1:01.03) Vanessa Ouwehand (59.07) Carter Swift (48.48) | 3:49.26 | |
| 18 | 1 | 4 | Mexico | Miranda Grana (1:03.11) Miguel de Lara (1:00.94) Athena Meneses (1:00.75) Andres Dupont (48.58) | 3:53.38 | |
| 19 | 5 | 9 | Estonia | Armin Evert Lelle (57.16) Eneli Jefimova (1:06.83) Daniel Zaitsev (52.61) Aleksa Gold (56.90) | 3:53.50 | |
| 20 | 1 | 2 | Belgium | Stan Franckx (56.25) Florine Gaspard (1:08.80) Valentine Dumont (59.67) Lucas Henveaux (49.34) | 3:54.06 | |
| 21 | 4 | 0 | Hungary | Áron Székely (55.96) Dalma Sebestyén (1:09.75) Lora Komoróczy (1:00.86) Dániel Mészáros (50.25) | 3:56.82 | |
| 22 | 5 | 0 | Colombia | Santiago Corredor (57.59) Jorge Murillo (1:01.41) Karen Durango (1:01.89) Sirena Rowe (56.58) | 3:57.47 | |
| 23 | 3 | 4 | Slovakia | Teresa Ivan (1:03.44) František Jablčník (1:06.21) Andrea Podmaníková (1:02.11) Matej Duša (49.93) | 4:01.69 | |
| 24 | 3 | 7 | Bahamas | Lamar Taylor (55.03) Rhanishka Gibbs (1:15.42) Davante Carey (54.80) Zaylie Thompson (58.73) | 4:03.98 | |
| 25 | 3 | 6 | Peru | Alexia Sotomayor (1:05.21) McKenna DeBever (1:14.36) Diego Balbi (54.18) Joaquín Vargas (51.25) | 4:05.00 | |
| 26 | 4 | 9 | Thailand | Saovanee Boonamphai (1:06.29) Dulyawat Kaewsriyong (1:05.50) Navaphat Wongcharoen (54.85) Kamonchanok Kwanmuang (58.49) | 4:05.03 | |
| 27 | 1 | 7 | Panama | Carolina Cermelli (1:04.75) Emily Santos (1:10.68) Jeancarlo Calderon Harper (56.95) Tyler Christianson (54.70) | 4:07.08 | |
| 28 | 2 | 1 | Armenia | Artur Barseghyan (1:02.72) Ashot Chakhoyan (1:05.45) Varsenik Manucharyan (1:03.02) Ani Poghosyan (58.64) | 4:09.83 | NR |
| 29 | 1 | 6 | Mongolia | Ariuntamir Enkh-Amgalan (1:08.41) Batbayar Enkhtamir (1:06.87) Enkhtur Erkhes (58.15) Batbayar Enkhkhuslen (57.02) | 4:10.45 | NR |
| 30 | 3 | 1 | Suspended Member Federation | Swaleh Abubakar Talib (1:06.03) Maria Brunlehner (1:13.83) Emily Muteti (1:02.71) Monyo Maina (52.79) | 4:15.36 | |
| 31 | 3 | 8 | Uganda | Adnan Kabuye (1:03.60) Tendo Mukalazi (1:07.40) Tara Naluwoza (1:09.31) Kirabo Namutebi (59.39) | 4:19.70 | |
| 32 | 3 | 0 | Angola | Salvador Gordo (1:01.31) Maria Lopes Freitas (1:20.21) Lia Ana Lima (1:07.36) Henrique Mascarenhas (52.27) | 4:21.15 | |
| 33 | 2 | 2 | Bahrain | Asma Lefahler (1:13.55) Abdulla Khalid Jamal (1:06.11) Ali Sadeq Alawi (1:00.75) Ayah Binrajab (1:03.99) | 4:24.40 | |
| 34 | 2 | 7 | Nigeria | Clinton Opute (1:07.38) Adaku Nwandu (1:23.16) Dorcas Abeng (57.10) Colins Obi Ebingha (1:01.26) | 4:28.90 | |
| 35 | 3 | 9 | Northern Mariana Islands | Isaiah Aleksenko (58.58) Maria Batallones (1:21.15) Anthony Deleon (1:03.42) Shoko Litulumar (1:08.78) | 4:31.93 | |
| 36 | 2 | 9 | Papua New Guinea | Abigail Ai Tom (1:15.56) Georgia-Leigh Vele (1:17.41) Nathaniel Noka (1:03.88) Josh Tarere (55.46) | 4:32.31 | |
| 37 | 2 | 8 | Micronesia | Kyler Anthony Kihleng (1:12.03) Tasi Limtiaco (1:04.17) Kestra Kihleng (1:14.09) Taeyanna Adams (1:06.67) | 4:36.96 | |
| 38 | 2 | 0 | Cape Verde | La Troya Pina (1:16.55) Jayla Pina (1:14.28) Troy Pina (1:06.82) Ailton Lima (59.46) | 4:37.11 | |
| 39 | 2 | 3 | Tanzania | Ria Save (1:16.14) Hilal Hemed Hilal (1:15.91) Collins Saliboko (58.97) Sophia Latiff (1:06.33) | 4:37.35 | |
| 40 | 1 | 3 | Tonga | Kapeli Siua (1:10.09) Noelani Day (1:25.13) Finau Ohuafi (1:00.29) Charissa Panuve (1:03.91) | 4:39.42 | |
| 41 | 2 | 4 | Guam | Israel Poppe (1:03.93) Amaya Bollinger (1:38.00) James Hendrix (57.58) Mia Lee (1:01.17) | 4:40.68 | NR |
| 42 | 2 | 5 | Maldives | Ali Imaan (1:05.47) Hamna Ahmed (1:31.10) Mohamed Rihan Shiham (1:03.93) Meral Ayn Latheef (1:10.14) | 4:50.64 | |
| | 1 | 5 | Antigua and Barbuda | Did not start | Did not start | Did not start |
| | 3 | 2 | Spain | Did not start | Did not start | Did not start |
| | 5 | 8 | Singapore | Did not start | Did not start | Did not start |
| | 2 | 6 | Malawi | Ammara Pinto (1:19.09) Filipe Gomes Muhammad Ali Moosa Tayamika Chang'Anamuno | Disqualified | Disqualified |

### Final

The final was held at 21:48.
| Rank | Lane | Nation | Swimmers | Time |
| | 6 | China | Xu Jiayu (52.42) Qin Haiyang (57.31) Zhang Yufei (55.69) Cheng Yujie (53.15) | 3:38.57 |
| | 5 | Australia | Kaylee McKeown (58.03) Zac Stubblety-Cook (58.84) Matthew Temple (50.63) Shayna Jack (51.53) | 3:39.03 |
| | 4 | United States | Ryan Murphy (52.02) Nic Fink (58.19) Torri Huske (58.19) Kate Douglass (51.79) | 3:40.19 |
| 4 | 3 | Netherlands | Maaike de Waard (1:00.05) Arno Kamminga (59.00) Nyls Korstanje (50.67) Marrit Steenbergen (52.09) | 3:41.81 |
| 5 | 2 | Great Britain | Medi Harris (59.76) James Wilby (59.47) Jacob Peters (51.11) Anna Hopkin (52.86) | 3:43.20 |
| 6 | 7 | Canada | Kylie Masse (59.19) James Dergousoff (1:00.69) Margaret MacNeil (56.30) Ruslan Gaziev (47.54) | 3:43.72 |
| 7 | 1 | Japan | Ryosuke Irie (53.42) Ippei Watanabe (59.60) Ai Soma (58.40) Rikako Ikee (53.91) | 3:45.33 |
| 8 | 8 | Germany | Ole Braunschweig (54.00) Lucas Matzerath (59.97) Angelina Köhler (56.74) Nele Schulze (54.91) | 3:45.62 |