# 2018 FINA World Swimming Championships (25 m) – Men's 4 × 50 metre medley relay

The men's 4 × 50 metre medley relay competition of the 2018 FINA World Swimming Championships (25 m) was held on 15 December 2018.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record | Kliment Kolesnikov (22.83) Kirill Prigoda (25.26) Aleksandr Popkov (22.11) Vladimir Morozov (20.24) | Russia | 1:30.44 | Copenhagen | 17 December 2017 |
| Championship record | Guilherme Guido (23.42) Felipe França Silva (25.33) Nicholas Santos (21.68) César Cielo (20.08) | Brazil | 1:30.51 | Doha, Qatar | 4 December 2014 |

## Results
### Heats

The heats were started at 09:30.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 2 | 1 | Brazil | Guilherme Guido (22.98) Felipe Lima (25.47) Matheus Santana (22.96) César Cielo (20.77) | 1:32.18 | Q |
| 2 | 1 | 4 | Italy | Simone Sabbioni (23.36) Nicolò Martinenghi (26.06) Marco Orsi (22.19) Santo Condorelli (20.59) | 1:32.30 | Q |
| 3 | 1 | 1 | United States | Matt Grevers (23.19) Andrew Wilson (26.01) Jack Conger (22.36) Michael Chadwick (20.81) | 1:32.37 | Q |
| 4 | 2 | 4 | Russia | Kliment Kolesnikov (23.23) Kirill Prigoda (25.51) Roman Shevliakov (22.72) Ivan Kuzmenko (20.94) | 1:32.40 | Q |
| 5 | 1 | 7 | Germany | Christian Diener (23.30) Fabian Schwingenschlögl (26.01) Marius Kusch (22.06) Damian Wierling (21.27) | 1:32.64 | Q |
| 6 | 2 | 7 | Japan | Ryosuke Irie (23.52) Yasuhiro Koseki (26.27) Kengo Ida (22.24) Kosuke Matsui (20.98) | 1:33.01 | Q |
| 7 | 2 | 3 | Australia | Mitch Larkin (23.36) Grayson Bell (26.51) Cameron Alexander Jones (22.45) Cameron McEvoy (20.74) | 1:33.06 | Q |
| 8 | 3 | 4 | Turkey | Iskender Baslakov (23.53) Hüseyin Emre Sakçı (25.64) Umitcan Gures (22.51) Kemal Arda Gürdal (21.43) | 1:33.11 | Q |
| 9 | 2 | 5 | Belarus | Viktar Staselovich (23.74) Ilya Shymanovich (25.49) Yauhen Tsurkin (22.58) Hryhory Pekarski (21.44) | 1:33.25 | R |
| 10 | 1 | 3 | China | Wang Peng (24.37) Wang Lizhuo (26.34) Li Zhuhao (22.67) Yu Hexin (21.14) | 1:34.52 | R |
| 11 | 2 | 6 | Ireland | Conor Ferguson (24.12) Darragh Greene (26.60) Brendan Hyland (23.40) Shane Ryan (20.93) | 1:35.05 | |
| 12 | 2 | 2 | Switzerland | Thierry Bollin (24.29) Jolann Bovey (26.97) Manuel Leuthard (23.35) Ivo Staub (21.84) | 1:36.45 | |
| 13 | 1 | 6 | Chinese Taipei | Chuang Mu-lun (24.86) Wu Chun-feng (26.48) Wang Kuan-hung (24.37) Lin Chien-liang (22.00) | 1:37.71 | |
| | 1 | 2 | Austria | Heiko Gigler (24.45) Christopher Rothbauer (26.78) Sascha Subarsky (23.04) Bernhard Reitshammer | DSQ | |

### Final

The final was held at 19:00.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 6 | Russia | Kliment Kolesnikov (22.87) Oleg Kostin (25.36) Mikhail Vekovishchev (22.09) Evgeny Rylov (20.22) | 1:30.54 | |
| | 3 | United States | Ryan Murphy (22.73) Michael Andrew (26.16) Caeleb Dressel (21.70) Ryan Held (20.31) | 1:30.90 | NR |
| | 4 | Brazil | Guilherme Guido (22.97) Felipe Lima (25.48) Nicholas Santos (22.02) César Cielo (21.02) | 1:31.49 | |
| 4 | 5 | Italy | Simone Sabbioni (23.40) Fabio Scozzoli (25.51) Marco Orsi (22.23) Santo Condorelli (20.40) | 1:31.54 | NR |
| 5 | 2 | Germany | Christian Diener (23.21) Fabian Schwingenschlögl (25.65) Marius Kusch (21.92) Damian Wierling (21.02) | 1:31.80 | |
| 6 | 0 | Belarus | Viktar Staselovich (23.77) Ilya Shymanovich (25.20) Yauhen Tsurkin(22.06) Artsiom Machekin (21.42) | 1:32.45 | |
| 7 | 7 | Japan | Ryosuke Irie (23.50) Yasuhiro Koseki (26.24) Kengo Ida (22.04) Kosuke Matsui (21.05) | 1:32.83 | |
| 8 | 1 | Australia | Mitch Larkin (23.34) Grayson Bell (26.62) Cameron Jones (22.33) Cameron McEvoy (20.90) | 1:33.19 | |
| 9 | 8 | Turkey | İskender Baskalov (23.89) Hüseyin Emre Sakçı (25.91) Ümitcan Güreş (22.90) Kemal Arda Gürdal (21.68) | 1:34.38 | |