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 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 Kirill Prigoda Aleksandr Popkov Vladimir Morozov | 1:30.44 | Copenhagen | 17 December 2017 | |
| Championship record | Guilherme Guido Felipe França Silva Nicholas Santos César Cielo | 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 | Guilherme Guido Felipe Lima Matheus Santana César Cielo | 1:32.18 | Q | |
| 2 | 1 | 4 | Simone Sabbioni Nicolò Martinenghi Marco Orsi Santo Condorelli | 1:32.30 | Q | |
| 3 | 1 | 1 | Matt Grevers Andrew Wilson Jack Conger Michael Chadwick | 1:32.37 | Q | |
| 4 | 2 | 4 | Kliment Kolesnikov Kirill Prigoda Roman Shevliakov Ivan Kuzmenko | 1:32.40 | Q | |
| 5 | 1 | 7 | Christian Diener Fabian Schwingenschlögl Marius Kusch Damian Wierling | 1:32.64 | Q | |
| 6 | 2 | 7 | Ryosuke Irie Yasuhiro Koseki Kengo Ida Kosuke Matsui | 1:33.01 | Q | |
| 7 | 2 | 3 | Mitch Larkin Grayson Bell Cameron Alexander Jones Cameron McEvoy | 1:33.06 | Q | |
| 8 | 3 | 4 | Iskender Baslakov Hüseyin Emre Sakçı Umitcan Gures Kemal Arda Gürdal | 1:33.11 | Q | |
| 9 | 2 | 5 | Viktar Staselovich Ilya Shymanovich Yauhen Tsurkin Hryhory Pekarski | 1:33.25 | R | |
| 10 | 1 | 3 | Wang Peng Wang Lizhuo Li Zhuhao Yu Hexin | 1:34.52 | R | |
| 11 | 2 | 6 | Conor Ferguson Darragh Greene Brendan Hyland Shane Ryan | 1:35.05 | ||
| 12 | 2 | 2 | Thierry Bollin Jolann Bovey Manuel Leuthard Ivo Staub | 1:36.45 | ||
| 13 | 1 | 6 | Chuang Mu-lun Wu Chun-feng Wang Kuan-hung Lin Chien-liang | 1:37.71 | ||
| 1 | 2 | Heiko Gigler Christopher Rothbauer Sascha Subarsky Bernhard Reitshammer |
Final
The final was held at 19:00.| Rank | Lane | Nation | Swimmers | Time | Notes |
| 6 | Kliment Kolesnikov Oleg Kostin Mikhail Vekovishchev Evgeny Rylov | 1:30.54 | |||
| 3 | Ryan Murphy Michael Andrew Caeleb Dressel Ryan Held | 1:30.90 | NR | ||
| 4 | Guilherme Guido Felipe Lima Nicholas Santos César Cielo | 1:31.49 | |||
| 4 | 5 | Simone Sabbioni Fabio Scozzoli Marco Orsi Santo Condorelli | 1:31.54 | ||
| 5 | 2 | Christian Diener Fabian Schwingenschlögl Marius Kusch Damian Wierling | 1:31.80 | ||
| 6 | 0 | Viktar Staselovich Ilya Shymanovich Yauhen Tsurkin Artsiom Machekin | 1:32.45 | ||
| 7 | 7 | Ryosuke Irie Yasuhiro Koseki Kengo Ida Kosuke Matsui | 1:32.83 | ||
| 8 | 1 | Mitch Larkin Grayson Bell Cameron Jones Cameron McEvoy | 1:33.19 | ||
| 9 | 8 | İskender Baskalov Hüseyin Emre Sakçı Ümitcan Güreş Kemal Arda Gürdal | 1:34.38 |