# 2021 FINA World Swimming Championships (25 m) – Men's 4 × 100 metre freestyle relay

The Men's 4 × 100 metre freestyle relay competition of the 2021 FINA World Swimming Championships (25 m) was held on 16 December 2021.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | United States (USA) | 3:03.03 | Hangzhou, China | 11 December 2018 |
| Competition record | United States (USA) | 3:03.03 | Hangzhou, China | 11 December 2018 |

## Results
### Heats

The heats were started at 12:29.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 1 | 4 | Russian Swimming Federation | Vladimir Morozov (47.07) Aleksandr Shchegolev (46.01) Andrey Minakov (45.94) Daniil Markov (47.00) | 3:06.02 | Q |
| 2 | 2 | 4 | United States | Shaine Casas (46.93) Tom Shields (47.07) Hunter Tapp (46.61) Ryan Held (46.17) | 3:06.78 | Q |
| 3 | 2 | 5 | Italy | Alessandro Miressi (46.76) Lorenzo Zazzeri (46.79) Leonardo Deplano (46.43) Manuel Frigo (47.02) | 3:07.00 | Q |
| 4 | 1 | 6 | Netherlands | Stan Pijnenburg (46.65) Thom de Boer (46.28) Nyls Korstanje (47.03) Jesse Puts (47.20) | 3:07.16 | Q, NR |
| 5 | 1 | 3 | Brazil | Gabriel Santos (46.91) Fernando Scheffer (47.03) Kaique Alves (47.13) Breno Correia (47.33) | 3:08.40 | Q |
| 6 | 2 | 3 | Great Britain | Matthew Richards (47.49) Edward Mildred (47.92) Tom Dean (47.02) Ben Proud (46.82) | 3:09.25 | Q, NR |
| 7 | 2 | 2 | China | Yang Jintong (48.77) Pan Zhanle (46.37) Hong Jinquan (47.39) Wang Changhao (46.88) | 3:09.41 | Q, NR |
| 8 | 2 | 6 | Switzerland | Roman Mityukov (48.06) Antonio Djakovic (47.18) Thomas Hallock (48.66) Robin Yeboah (48.83) | 3:12.73 | Q, NR |
| 9 | 1 | 5 | Ireland | Jack McMillan (47.82) Calum Bain (47.67) Brendan Hyland (48.88) Jordan Sloan (48.57) | 3:12.94 | |
| 10 | 1 | 1 | Hong Kong | Cheuk Ming Ho (48.76) Ian Ho (47.81) Ng Yan Kin (50.01) Ng Cheuk Yin (48.86) | 3:15.44 | NR |
| 11 | 1 | 7 | South Korea | Won Young-jun (48.87) Moon Seung-woo (49.77) Kim Woo-min (48.78) Lee Ho-joon (49.06) | 3:16.48 | NR |
| 12 | 2 | 7 | Turkey | Baturalp Ünlü (48.45) Efe Turan (49.60) Metin Aydın (49.10) Berke Saka (49.95) | 3:17.10 | |
| 13 | 2 | 1 | Egypt | Mohamed Samy (49.98) Marwan Elkamash (51.11) Abdelrahman Sameh (48.37) Youssef Ramadan (49.03) | 3:18.49 | NR |
| 14 | 2 | 8 | Kuwait | Waleed Abdulrazzaq (49.49) Ali Al-Zamil (53.09) Sauod Al-Shamroukh (52.66) Faisal Al-Tannak (53.30) | 3:28.54 | |
| 15 | 1 | 8 | Vietnam | Nguyễn Hữu Kim Sơn (51.87) Trần Hưng Nguyên (50.94) Hồ Nguyễn Duy Khoa (52.76) Phạm Thanh Bảo (57.90) | 3:33.47 | |
| | 1 | 2 | Singapore | | DNS | |

### Final

The final was held at 19:56.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | Russian Swimming Federation | Kliment Kolesnikov (46.44) Andrey Minakov (45.61) Vladislav Grinev (45.87) Aleksandr Shchegolev (45.53) | 3:03.45 | |
| | 3 | Italy | Alessandro Miressi (46.12) Thomas Ceccon (45.71) Leonardo Deplano (45.98) Lorenzo Zazzeri (45.80) | 3:03.61 | NR |
| | 5 | United States | Ryan Held (45.75) Hunter Tapp (46.78) Shaine Casas (46.50) Zach Apple (46.39) | 3:05.42 | |
| 4 | 6 | Netherlands | Stan Pijnenburg (46.64) Thom de Boer (46.60) Nyls Korstanje (46.82) Jesse Puts (46.04) | 3:06.10 | NR |
| 5 | 1 | China | Pan Zhanle (47.43) Wang Changhao (47.32) Hong Jinquan (46.91) Yang Jintong (48.45) | 3:10.11 | |
| 6 | 7 | Great Britain | Tom Dean (47.35) Ben Proud (47.60) Edward Mildred (47.57) Matthew Richards (47.67) | 3:10.19 | |
| 7 | 8 | Switzerland | Roman Mityukov (47.67) Antonio Djakovic (47.21) Thomas Hallock (48.25) Robin Yeboah (48.40) | 3:11.53 | NR |
| | 2 | Brazil | Gabriel Santos (47.21) Fernando Scheffer Kaique Alves Breno Correia | DSQ | |