# 2024 World Aquatics Swimming Championships (25 m) – Mixed 4 × 100 metre medley relay

The Mixed 4 × 100 metre medley relay competition of the 2024 World Aquatics Swimming Championships (25 m) was held on 14 December 2024.

## Results
### Heats

The heats were started at 11:53.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 5 | 4 | United States | Shaine Casas (50.04) AJ Pouch (56.76) Alex Shackell (55.70) Alex Walsh (51.80) | 3:34.30 | Q |
| 2 | 5 | 5 | Australia | Iona Anderson (56.29) Joshua Yong (56.46) Matthew Temple (48.84) Milla Jansen (52.72) | 3:34.31 | Q |
| 3 | 5 | 3 | Netherlands | Maaike de Waard (56.66) Caspar Corbeau (56.69) Nyls Korstanje (49.75) Milou van Wijk (52.20) | 3:35.30 | Q |
| 4 | 4 | 5 | Canada | Blake Tierney (50.48) Sophie Angus (1:03.89) Finlay Knox (49.96) Penny Oleksiak (51.97) | 3:36.30 | Q |
| 5 | 4 | 3 | Great Britain | Oliver Morgan (50.83) Angharad Evans (1:03.64) Joshua Gammon (50.16) Eva Okaro (51.76) | 3:36.39 | Q |
| 6 | 1 | 4 | Neutral Athletes B | Pavel Samusenko (50.30) Aleksandr Zhigalov (56.84) Arina Surkova (56.95) Daria Trofimova (52.31) | 3:36.40 | Q |
| 7 | 5 | 1 | Spain | Carmen Weiler (56.89) Carles Coll (57.21) Mario Mollá (49.36) María Daza (53.32) | 3:36.78 | Q, NR |
| 8 | 4 | 6 | Italy | Lorenzo Mora (50.67) Ludovico Viberti (57.51) Elena Capretta (57.06) Sofia Morini (52.02) | 3:37.26 | Q, NR |
| 9 | 5 | 6 | Japan | Masaki Yura (51.23) Taku Taniguchi (56.44) Mizuki Hirai (56.07) Yume Jinno (53.62) | 3:37.36 | |
| 10 | 5 | 7 | South Africa | Ruard van Renen (50.07) Rebecca Meder (1:04.81) Chad le Clos (49.57) Caitlin de Lange (53.26) | 3:37.71 | |
| 11 | 4 | 2 | Poland | Kacper Stokowski (49.78) Dominika Sztandera (1:04.38) Jakub Majerski (50.08) Kornelia Fiedkiewicz (53.52) | 3:37.76 | NR |
| 12 | 5 | 2 | Sweden | Samuel Törnqvist (51.05) Daniel Kertes (57.95) Sara Junevik (56.48) Sofia Åstedt (52.67) | 3:38.15 | NR |
| 13 | 4 | 4 | China | Wang Gukailai (50.91) Yu Zongda (58.22) Chen Luying (56.88) Luo Mingyu (53.09) | 3:39.10 | NR |
| 14 | 4 | 7 | Hungary | Ádám Jászó (51.84) Henrietta Fángli (1:05.41) Panna Ugrai (57.09) Boldizsár Magda (47.24) | 3:41.58 | NR |
| 15 | 4 | 8 | Hong Kong | Hayden Kwan (52.14) Adam Mak (58.38) Yeung Hoi Ching (58.16) Li Sum Yiu (53.69) | 3:42.37 | NR |
| 16 | 5 | 8 | Kazakhstan | Xeniya Ignatova (59.34) Arsen Kozhakhmetov (58.00) Adilbek Mussin (50.15) Sofia Spodarenko (55.32) | 3:42.81 | |
| 17 | 3 | 5 | Slovakia | Martin Perečinský (52.71) Andrea Podmaníková (1:06.78) Tamara Potocká (56.76) Jakub Poliačik (48.30) | 3:44.55 | NR |
| 18 | 4 | 1 | New Zealand | Cooper Morley (51.76) Brearna Crawford (1:07.70) Ben Littlejohn (52.14) Zoe Pedersen (53.40) | 3:45.00 | NR |
| 19 | 1 | 6 | Iceland | Guðmundur Leo Rafnsson (53.14) Einar Margeir Ágústsson (57.95) Jóhanna Elín Guðmundsdóttir (1:00.90) Snæfríður Jórunnardóttir (53.02) | 3:45.01 | NR |
| 20 | 3 | 6 | Peru | Alexia Sotomayor (1:00.74) Anthony Puertas (1:02.00) Diego Balbi (51.80) Rafaela Fernandini (55.41) | 3:49.95 | NR |
| 21 | 3 | 7 | Dominican Republic | Elizabeth Jiménez (1:01.19) Josué Domínguez (59.17) Javier Núñez (52.97) Darielys Ortiz (58.28) | 3:51.61 | NR |
| 22 | 3 | 2 | Namibia | Jessica Humphrey (1:01.56) Ronan Wantenaar (59.77) Oliver Durand (54.61) Molina Smalley (58.84) | 3:54.78 | NR |
| 23 | 2 | 3 | Kyrgyzstan | Elizaveta Pecherskikh (1:03.66) Denis Petrashov (57.38) Daniil Mistriukov (58.8) Aiymkyz Aidaralieva (59.18) | 3:59.02 | |
| 24 | 2 | 6 | Kenya | Imara Thorpe (1:03.55) Haniel Kudwoli (1:02.34) Stephen Nyoike (57.41) Sara Mose (56.24) | 3:59.54 | NR |
| 25 | 2 | 8 | Moldova | Natalia Zaiteva (1:04.01) Constantin Malachi (1:00.82) Anastasia Basisto (1:04.03) Chirill Chirsanov (52.29) | 4:01.15 | |
| 26 | 2 | 1 | Jordan | Adnan Al-Abdallat (59.44) Amro Al-Wir (59.91) Tara Al-Oul (1:05.65) Karin Belbeisi (1:00.75) | 4:05.75 | NR |
| 27 | 1 | 2 | Uganda | Kirabo Namutebi (1:07.61) Tendo Mukalazi (1:04.06) Tendo Kaumi (59.94) Gloria Anna Muzito (54.59) | 4:06.20 | NR |
| 28 | 2 | 7 | North Korea | Kim Sol-song (1:08.84) Kim Won-ju (1:05.15) Kim Ryong-hyon (56.41) Pak Mi-song (57.20) | 4:07.60 | |
| 29 | 3 | 8 | Madagascar | Idealy Tendrinavalona (1:05.05) Jonathan Raharvel (1:02.27) Baritiana Andriampenomanana (1:01.37) Antsa Rabejaona (59.00) | 4:07.69 | NR |
| 30 | 1 | 7 | Samoa | Kaiya Brown (1:09.92) Kokoro Frost (1:07.96) Paige Schendelaar-Kemp (1:01.91) Hector Langkilde (49.70) | 4:09.49 | |
| 31 | 2 | 4 | Northern Mariana Islands | Piper Raho (1:09.54) Kouki Cerezo Watanabe (1:05.67) Taiyo Akimaru (59.22) Maria Batallones (1:02.63) | 4:17.06 | |
| 32 | 2 | 2 | Maldives | Mohamed Rihan Shiham (1:03.27) Hamna Ahmed (1:24.36) Meral Ayn Latheef (1:12.29) Mohamed Aan Hussain (52.13) | 4:32.05 | |
| | 1 | 3 | Neutral Athletes A | Anastasiya Shkurdai (57.60) Ilya Shymanovich (57.69) Anastasiya Kuliashova (56.64) Grigori Pekarski | Disqualified | Disqualified |
| | 3 | 1 | Guatemala | Melissa Diego (1:02.17) Nicole Mack Erick Gordillo Miguel Vásquez | Disqualified | Disqualified |
| | 3 | 3 | Finland | Ronny Brännkärr Davin Lindholm Laura Lahtinen Fanny Teijonsalo | Did not start | Did not start |

### Final

The final was held at 19:14.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 7 | Neutral Athletes B | Miron Lifintsev (48.90) Kirill Prigoda (54.86) Arina Surkova (55.63) Daria Klepikova (51.08) | 3:30.47 | |
| | 4 | United States | Regan Smith (54.19) Lilly King (1:03.05) Dare Rose (48.68) Jack Alexy (44.63) | 3:30.55 | |
| | 6 | Canada | Ingrid Wilm (55.82) Finlay Knox (56.39) Ilya Kharun (48.27) Mary-Sophie Harvey (51.49) | 3:31.97 | |
| 4 | 5 | Australia | Iona Anderson (55.89) Joshua Yong (56.40) Matthew Temple (48.63) Milla Jansen (51.91) | 3:32.83 | |
| 5 | 2 | Great Britain | Oliver Morgan (50.53) Angharad Evans (1:03.44) Joshua Gammon (50.00) Eva Okaro (51.49) | 3:35.46 | |
| 6 | 1 | Spain | Carmen Weiler (56.97) Carles Coll (56.63) Mario Mollá (49.19) María Daza (52.73) | 3:35.52 | NR |
| 7 | 8 | Italy | Lorenzo Mora (50.11) Ludovico Viberti (57.08) Elena Capretta (56.77) Sara Curtis (51.58) | 3:35.54 | NR |
| 8 | 3 | Netherlands | Maaike de Waard (57.14) Caspar Corbeau (56.47) Nyls Korstanje (49.83) Milou van Wijk (52.60) | 3:36.04 | |