Swimming at the 2019 World Aquatics Championships – Men's 4 × 100 metre medley relay
The Men's 4 × 100 metre medley relay competition at the 2019 World Championships was held on 28 July 2019. The final was won by the British team in a European record time of three minutes, 28.10 seconds.
Records
Prior to the competition, the existing world and championship records were as follows.Results
Heats
The heats were held on 28 July at 10:50.Final
The final was held on 28 July at 21:38.| Rank | Lane | Nation | Swimmers | Time | Notes |
| 6 | Luke Greenbank Adam Peaty James Guy Duncan Scott | 3:28.10 | ER | ||
| 5 | Ryan Murphy Andrew Wilson Caeleb Dressel Nathan Adrian | 3:28.45 | |||
| 4 | Evgeny Rylov Kirill Prigoda Andrey Minakov Vladimir Morozov | 3:28.81 | NR | ||
| 4 | 3 | Ryosuke Irie Yasuhiro Koseki Naoki Mizunuma Katsumi Nakamura | 3:30.35 | ||
| 5 | 2 | Mitch Larkin Matthew Wilson Matthew Temple Kyle Chalmers | 3:30.42 | ||
| 6 | 7 | Guilherme Guido João Gomes Júnior Vinicius Lanza Marcelo Chierighini | 3:30.86 | ||
| 7 | 1 | Xu Jiayu Yan Zibei Li Zhuhao Cao Jiwen | 3:31.61 | ||
| 8 | 8 | Christian Diener Fabian Schwingenschlögl Marius Kusch Damian Wierling | 3:32.86 |