# Swimming at the 2024 World Aquatics Championships – Mixed 4 × 100 metre freestyle relay

The Mixed 4 × 100 metre freestyle relay competition at the 2024 World Aquatics Championships was held on 17 February 2024.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Australia | 3:18.83 | Fukuoka, Japan | 29 July 2023 |
| Competition record | Australia | 3:18.83 | Fukuoka, Japan | 29 July 2023 |

## Results
### Heats

The heats were started at 10:19.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 3 | 3 | China | Wang Haoyu (48.28) Ji Xinjie (47.86) Yu Yiting (53.90) Ai Yanhan (54.43) | 3:24.47 | Q, AS |
| 2 | 3 | 5 | Canada | Finlay Knox (48.93) Javier Acevedo (47.98) Rebecca Smith (54.45) Taylor Ruck (53.42) | 3:24.78 | Q |
| 3 | 3 | 4 | Australia | Kai Taylor (48.73) Jack Cartwright (48.03) Alexandria Perkins (54.58) Abbey Harkin (53.96) | 3:25.30 | Q |
| 4 | 2 | 5 | Italy | Lorenzo Zazzeri (48.51) Manuel Frigo (48.62) Sofia Morini (54.66) Chiara Tarantino (54.27) | 3:26.06 | Q |
| 5 | 2 | 4 | United States | Luke Hobson (48.50) Jack Aikins (48.92) Addison Sauickie (54.83) Kayla Han (56.51) | 3:28.76 | Q |
| 6 | 3 | 6 | Netherlands | Stan Pijnenburg (49.08) Thom de Boer (49.43) Milou van Wijk (55.48) Janna van Kooten (55.24) | 3:29.23 | Q |
| 7 | 2 | 2 | Slovakia | Matej Duša (49.23) Tibor Tistan (50.64) Lillian Slušná (55.92) Teresa Ivan (55.88) | 3:31.67 | Q |
| 8 | 3 | 7 | Hong Kong | Lau Shiu Yue (52.30) Ian Ho (48.80) Camille Cheng (55.29) Tam Hoi Lam (55.80) | 3:32.19 | Q, NR |
| 9 | 1 | 6 | Philippines | Jarod Hatch (51.65) Kayla Sanchez (55.08) Teia Salvino (57.21) Jerard Jacinto (52.59) | 3:36.53 | |
| 10 | 2 | 7 | Thailand | Dulyawat Kaewsriyong (50.28) Tonnam Kanteemool (50.88) Kamonchanok Kwanmuang (58.42) Jenjira Srisa-Ard (1:00.27) | 3:39.85 | |
| 11 | 3 | 8 | Uganda | Jesse Ssuubi Ssengonzi (52.07) Tendo Mukalazi (51.66) Kirabo Namutebi (1:00.28) Gloria Anna Muzito (56.34) | 3:40.35 | |
| 12 | 1 | 4 | Kenya | Monyo Maina (52.94) Ridhwan Mohamed (52.67) Imara Thorpe (59.28) Maria Brunlehner (57.39) | 3:42.28 | NR |
| 13 | 2 | 1 | Armenia | Artur Barseghyan (50.41) Ashot Chakhoyan (54.78) Varsenik Manucharyan (1:00.30) Ani Poghosyan (58.80) | 3:44.29 | |
| 14 | 1 | 5 | Dominican Republic | Anthony Piñeiro (52.72) María Alejandra Fernández (1:01.81) Alejandra Santana (1:02.82) Javier Núñez (50.82) | 3:48.17 | |
| 15 | 3 | 1 | Bahamas | Lamar Taylor (53.19) Marvin Johnson (53.81) Victoria Russell (1:02.01) Rhanishka Gibbs (1:00.62) | 3:49.63 | |
| 16 | 2 | 8 | Guam | Israel Poppe (54.12) James Hendrix (53.87) Amaya Bollinger (1:03.04) Mia Lee (1:01.26) | 3:52.29 | NR |
| 17 | 1 | 3 | Tonga | Carolann Faeamani (1:04.46) Alan Uhi (55.76) Charissa Panuve (1:03.76) Finau Ohuafi (53.92) | 3:57.90 | |
| 18 | 3 | 0 | Bahrain | Saud Ghali (55.27) Ahmed Theibich (56.98) Amani Al-Obaidli (1:01.65) Noor Yussuf Abdulla (1:04.01) | 3:57.91 | |
| 19 | 2 | 0 | Micronesia | Tasi Limtiaco (55.01) Kestra Kihleng (1:05.27) Katerson Moya (57.81) Taeyanna Adams (1:07.22) | 4:05.31 | |
| 20 | 2 | 9 | Maldives | Mubal Azzam Ibrahim (57.69) Aishath Shaig (1:10.06) Hamna Ahmed (1:09.50) Mohamed Rihan Shiham (56.92) | 4:14.17 | |
| | 2 | 3 | Sweden | Did not start | Did not start | Did not start |
| | 2 | 6 | Hungary | Did not start | Did not start | Did not start |
| | 3 | 2 | South Africa | Did not start | Did not start | Did not start |

### Final

The final was held on 17 February at 20:45.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | China | Pan Zhanle (47.29) Wang Haoyu (47.41) Li Bingjie (53.11) Yu Yiting (53.37) | 3:21.18 | AS |
| | 3 | Australia | Kai Taylor (48.01) Jack Cartwright (47.90) Shayna Jack (52.38) Brianna Throssell (53.49) | 3:21.78 | |
| | 2 | United States | Hunter Armstrong (47.83) Matt King (47.78) Claire Curzan (53.82) Kate Douglass (52.85) | 3:22.28 | |
| 4 | 5 | Canada | Finlay Knox (48.79) Javier Acevedo (47.58) Taylor Ruck (53.28) Rebecca Smith (54.14) | 3:23.79 | |
| 5 | 6 | Italy | Alessandro Miressi (48.06) Manuel Frigo (48.06) Sofia Morini (54.23) Chiara Tarantino (54.05) | 3:24.40 | |
| 6 | 7 | Netherlands | Stan Pijnenburg (48.84) Caspar Corbeau (49.05) Kira Toussaint (54.51) Marrit Steenbergen (52.74) | 3:25.14 | |
| 7 | 8 | Slovakia | Matej Duša (49.37) Tibor Tistan (50.32) Lillian Slušná (55.17) Teresa Ivan (55.02) | 3:29.88 | NR |
| 8 | 1 | Hong Kong | Lau Shiu Yue (52.24) Ian Ho (48.66) Camille Cheng (54.71) Tam Hoi Lam (55.52) | 3:31.13 | NR |