# Swimming at the 2020 European Aquatics Championships – Men's 400 metre freestyle

The Men's 400 metre freestyle competition of the 2020 European Aquatics Championships was held on 17 May 2021.

## Records

Before the competition, the existing world, European and championship records were as follows.
| | Name | Nationality | Time | Location | Date |
| World record European record | Paul Biedermann | Germany | 3:40.07 | Rome | 26 July 2009 |
| Championship record | Gabriele Detti | Italy | 3:44.01 | London | 16 May 2016 |

## Results
### Heats

The heats were started at 10:14.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 7 | Antonio Djakovic | Switzerland | 3:47.23 | Q |
| 2 | 4 | 2 | Henrik Christiansen | Norway | 3:47.51 | Q |
| 3 | 5 | 4 | Gabriele Detti | Italy | 3:47.56 | Q |
| 4 | 5 | 5 | Felix Auböck | Austria | 3:47.61 | Q |
| 5 | 4 | 5 | Marco De Tullio | Italy | 3:47.81 | Q |
| 6 | 4 | 3 | Martin Malyutin | Russia | 3:47.95 | Q |
| 7 | 4 | 4 | Danas Rapšys | Lithuania | 3:48.05 | Q |
| 8 | 3 | 1 | Kregor Zirk | Estonia | 3:48.39 | Q, NR |
| 9 | 3 | 8 | Max Litchfield | Great Britain | 3:48.41 | |
| 10 | 5 | 7 | Matteo Ciampi | Italy | 3:48.57 | |
| 11 | 4 | 8 | Konstantinos Englezakis | Greece | 3:48.59 | NR |
| 12 | 4 | 6 | Gábor Zombori | Hungary | 3:48.88 | |
| 13 | 2 | 5 | Dimitrios Markos | Greece | 3:49.22 | |
| 14 | 5 | 2 | Aleksandr Egorov | Russia | 3:49.42 | |
| 15 | 2 | 3 | Mikkel Gadgaard | Denmark | 3:49.93 | |
| 16 | 4 | 0 | Balázs Holló | Hungary | 3:50.06 | |
| 17 | 5 | 1 | Joris Bouchaut | France | 3:50.48 | |
| 18 | 3 | 7 | Yiğit Aslan | Turkey | 3:50.59 | |
| 19 | 5 | 3 | Alexander Krasnykh | Russia | 3:50.77 | |
| 20 | 4 | 1 | Kristóf Milák | Hungary | 3:51.59 | |
| 21 | 3 | 5 | Yordan Yanchev | Bulgaria | 3:51.79 | |
| 22 | 3 | 9 | Martin Bau | Slovenia | 3:51.89 | |
| 23 | 2 | 6 | Christoffer Andersen | Denmark | 3:52.29 | |
| 24 | 3 | 6 | Luc Kroon | Netherlands | 3:52.93 | |
| 25 | 5 | 6 | Kieran Bird | Great Britain | 3:53.97 | |
| 26 | 4 | 9 | Ákos Kalmár | Hungary | 3:54.18 | |
| 27 | 3 | 3 | Robin Hanson | Sweden | 3:54.48 | |
| 28 | 5 | 8 | Miguel Durán | Spain | 3:54.72 | |
| 29 | 5 | 9 | Bar Soloveychik | Israel | 3:55.18 | |
| 30 | 1 | 3 | Ilya Borodin | Russia | 3:55.46 | |
| 31 | 1 | 4 | Oskar Lindholm | Denmark | 3:55.89 | |
| 32 | 1 | 5 | Ondřej Gemov | Czech Republic | 3:56.37 | |
| 33 | 2 | 4 | Arthur Ellegaard | Denmark | 3:56.82 | |
| 34 | 3 | 4 | Jan Micka | Czech Republic | 3:57.62 | |
| 35 | 3 | 2 | Efe Turan | Turkey | 3:58.13 | |
| 36 | 2 | 0 | Jakub Štemberk | Czech Republic | 3:58.38 | |
| 37 | 2 | 2 | Baturalp Ünlü | Turkey | 3:58.57 | |
| 38 | 1 | 6 | Jakub Poliačik | Slovakia | 4:01.56 | |
| 39 | 2 | 8 | Mert Kılavuz | Turkey | 4:01.97 | |
| 40 | 2 | 7 | Daniel Namir | Israel | 4:02.39 | |
| 41 | 1 | 2 | Arti Krasniqi | Kosovo | 4:03.39 | |
| 42 | 5 | 0 | Marin Mogić | Croatia | 4:03.67 | |
| 43 | 1 | 8 | Loris Bianchi | San Marino | 4:03.69 | |
| 44 | 2 | 9 | Pit Brandenburger | Luxembourg | 4:03.71 | |
| 45 | 2 | 1 | Jon Jøntvedt | Norway | 4:03.92 | |
| 46 | 1 | 0 | Filip Derkoski | North Macedonia | 4:04.10 | |
| 47 | 1 | 7 | Dylan Cachia | Malta | 4:06.91 | |
| 48 | 1 | 1 | Franc Aleksi | Albania | 4:11.45 | |
| 49 | 1 | 9 | Théo Druenne | Monaco | 4:15.17 | |
| | 3 | 0 | Franko Grgić | Croatia | Did not start | Did not start |

### Final

The final was held at 18:09.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 7 | Martin Malyutin | Russia | 3:44.18 | |
| | 6 | Felix Auböck | Austria | 3:44.63 | |
| | 1 | Danas Rapšys | Lithuania | 3:45.39 | |
| 4 | 3 | Gabriele Detti | Italy | 3:46.07 | |
| 5 | 2 | Marco De Tullio | Italy | 3:46.36 | |
| 6 | 4 | Antonio Djakovic | Switzerland | 3:46.54 | |
| 7 | 5 | Henrik Christiansen | Norway | 3:46.87 | |
| 8 | 8 | Kregor Zirk | Estonia | 3:48.35 | NR |