# Swimming at the 2024 World Aquatics Championships – Men's 4 × 100 metre medley relay

The Men's 4 × 100 metre medley relay competition at the 2024 World Aquatics Championships was held on 18 February 2024.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | United States | 3:26.78 | Tokyo, Japan | 1 August 2021 |
| Competition record | United States | 3:27.20 | Fukuoka, Japan | 30 July 2023 |

## Results
### Heats

The heats were held at 10:09.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 2 | 4 | United States | Jack Aikins (53.84) Jake Foster (59.45) Shaine Casas (50.99) Luke Hobson (48.25) | 3:32.53 | Q |
| 2 | 1 | 4 | Netherlands | Kai van Westering (54.11) Caspar Corbeau (59.02) Nyls Korstanje (51.42) Stan Pijnenburg (48.34) | 3:32.89 | Q, NR |
| 3 | 2 | 7 | Spain | Hugo González (53.19) Carles Coll Martí (1:00.56) Mario Molla Yanes (51.69) Sergio De Celis Montalban (48.13) | 3:33.57 | Q |
| 4 | 3 | 2 | Poland | Ksawery Masiuk (53.57) Jan Kałusowski (1:00.44) Jakub Majerski (51.29) Kamil Sieradzki (48.49) | 3:33.79 | Q |
| 5 | 3 | 3 | Canada | Blake Tierney (53.98)) James Dergousoff (1:00.77) Finlay Knox (51.90) Javier Acevedo (47.51) | 3:34.16 | Q |
| 6 | 3 | 6 | Italy | Michele Lamberti (54.23) Ludovico Blu Art Viberti (59.19) Federico Burdisso (52.25) Alessandro Miressi (48.53) | 3:34.20 | Q |
| 7 | 2 | 6 | Austria | Bernhard Reitshammer (54.77) Valentin Bayer (1:00.21) Simon Bucher (51.38) Heiko Gigler (47.93) | 3:34.29 | Q |
| 8 | 3 | 7 | Ireland | Conor Ferguson (54.04) Darragh Greene (1:00.16) Max McCusker (51.83) Shane Ryan (48.94) | 3:34.97 | Q |
| 9 | 3 | 5 | Australia | Bradley Woodward (54.17) Sam Williamson (59.11) Kai James Taylor (53.64) Jack Cartwright (48.63) | 3:35.55 | |
| 10 | 3 | 1 | Portugal | Gabriel Lopes (54.80) Francisco Robalo Quintas (1:01.15) Diogo Ribeiro (51.26) Miguel Nascimento (48.42) | 3:35.63 | =NR |
| 11 | 2 | 5 | South Korea | Lee Ju-ho (54.10) Choi Dong-yeol (1:00.07) Yang Jae-hoon (52.95) Hwang Sun-woo (48.73) | 3:35.85 | |
| 12 | 3 | 4 | China | Xu Yifan (56.44) Dong Zhihao (59.23) Wang Xizhe (52.76) Ji Xinjie (48.25) | 3:36.68 | |
| 13 | 2 | 2 | Hungary | Adam Jaszo (54.89) Daniel Sos (1:01.66) Richard Marton (52.50) Nandor Nemeth (47.81) | 3:36.86 | |
| 14 | 2 | 1 | Mexico | Diego Camacho Salgado (55.83) Miguel Alejandro de Lara Ojeda (1:00.52) Jorge Iga (52.46) Andres Dupont Cabrera (48.07) | 3:36.88 | NR |
| 15 | 2 | 9 | Greece | Evangelos Makrygiannis (53.61) Arkadios Aspougalis (1:01.97) Konstantinos Emmanouil Stamou (52.58) Stergios Marios Bilas (48.95) | 3:37.11 | |
| 16 | 3 | 0 | South Africa | Pieter Coetze (53.69) Matthew Randle (1:02.83) Chad le Clos (51.60) Clayton Jimmie (49.17) | 3:37.29 | |
| 17 | 1 | 3 | Bulgaria | Kaloyan Levterov (56.10) Lyubomir Epitropov (1:00.65) Josif Miladinov (52.61) Kaloyan Bratanov (48.56) | 3:37.92 | |
| 18 | 1 | 5 | Serbia | Velimir Stjepanovic (55.79) Uros Zivanovic (1:02.42) Durde Matic (51.89) Andrej Barna (47.88) | 3:37.98 | NR |
| 19 | 2 | 8 | Kazakhstan | Yegor Popov (55.86) Arsen Kozhakhmetov (1:01.92) Maxim Skazobtsov (52.92) Adilbek Mussin (48.51) | 3:39.21 | |
| 20 | 2 | 3 | Japan | Osamu Kato (54.55) Ikuru Hiroshima (1:01.28) Nao Horomura (53.00) Riki Abe (51.08) | 3:39.91 | |
| 21 | 2 | 0 | Thailand | Ratthawit Thammananthachote (58.54) Dulyawat Kaewsriyong (1:07.07) Navaphat Wongcharoen (54.22) Tonnam Kanteemool (51.69) | 3:51.52 | |
| 22 | 3 | 9 | Vietnam | Tran Hung Nguyen (1:00.72) Pham Thanh Bao (1:04.05) Nguyen Hoang Khang (58.70) Ngo Dinh Chuyen (54.52) | 3:57.99 | |
| | 3 | 8 | Sweden | | Did not start | Did not start |

### Final

The final was held at 20:37.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | United States | Hunter Armstrong (53.15) Nic Fink (58.20) Zach Harting (51.13) Matt King (47.32) | 3:29.80 | |
| | 5 | Netherlands | Kai van Westering (53.84) Arno Kamminga (58.23) Nyls Korstanje (51.12) Stan Pijnenburg (48.04) | 3:31.23 | NR |
| | 7 | Italy | Michele Lamberti (54.28) Nicolò Martinenghi (57.97) Gianmarco Sansone (52.14) Alessandro Miressi (47.20) | 3:31.59 | |
| 4 | 2 | Canada | Blake Tierney (53.65)) James Dergousoff (59.89) Finlay Knox (51.60) Javier Acevedo (47.75) | 3:32.89 | |
| 5 | 3 | Spain | Hugo González (53.11) Carles Coll Martí (1:00.88) Mario Molla Yanes (51.14) Sergio De Celis Montalban (48.07) | 3:33.20 | |
| 6 | 1 | Austria | Bernhard Reitshammer (54.72) Valentin Bayer (1:00.61) Simon Bucher (51.27) Heiko Gigler (48.02) | 3:34.62 | |
| 7 | 8 | Ireland | Conor Ferguson (54.46) Darragh Greene (1:00.20) Max McCusker (51.78) Shane Ryan (48.84) | 3:35.28 | |
| | 6 | Poland | Ksawery Masiuk (53.55) Jan Kałusowski Jakub Majerski Kamil Sieradzki | Disqualified | Disqualified |