# Swimming at the 2024 World Aquatics Championships – Men's 400 metre freestyle

The men's 400 metre freestyle competition at the 2024 World Aquatics Championships was held on 11 February 2024.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Paul Biedermann (GER) | 3:40.07 | Rome, Italy | 26 July 2009 |
| Competition record | Paul Biedermann (GER) | 3:40.07 | Rome, Italy | 26 July 2009 |

## Results
### Heats

The heats were started at 09:44.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 5 | Elijah Winnington | Australia | 3:44.37 | Q |
| 2 | 5 | 4 | Lukas Märtens | Germany | 3:44.77 | Q |
| 3 | 6 | 3 | Kim Woo-min | South Korea | 3:45.14 | Q |
| 4 | 6 | 2 | Daniel Wiffen | Ireland | 3:45.52 | Q |
| 5 | 5 | 3 | Felix Auböck | Austria | 3:45.53 | Q |
| 6 | 5 | 5 | Guilherme Costa | Brazil | 3:46.03 | Q |
| 7 | 5 | 0 | Lucas Henveaux | Belgium | 3:46.15 | Q, NR |
| 8 | 4 | 6 | Victor Johansson | Sweden | 3:46.20 | Q, NR |
| 9 | 4 | 5 | David Aubry | France | 3:46.40 | |
| 10 | 5 | 7 | Zhang Zhanshuo | China | 3:46.46 | |
| 11 | 5 | 8 | Kristóf Rasovszky | Hungary | 3:46.77 | |
| 12 | 6 | 1 | David Johnston | United States | 3:46.99 | |
| 13 | 6 | 8 | Fei Liwei | China | 3:47.06 | |
| 14 | 6 | 0 | Matteo Ciampi | Italy | 3:47.23 | |
| 15 | 6 | 6 | Antonio Djakovic | Switzerland | 3:47.81 | |
| 16 | 5 | 1 | Sven Schwarz | Germany | 3:47.82 | |
| 17 | 6 | 4 | Ahmed Hafnaoui | Tunisia | 3:48.05 | |
| 18 | 5 | 9 | Alfonso Mestre | Venezuela | 3:48.38 | |
| 19 | 3 | 5 | Krzysztof Chmielewski | Poland | 3:48.71 | |
| 20 | 6 | 7 | Danas Rapšys | Lithuania | 3:48.72 | |
| 21 | 4 | 9 | Khiew Hoe Yean | Malaysia | 3:49.14 | |
| 22 | 4 | 2 | Kregor Zirk | Estonia | 3:49.34 | |
| 23 | 5 | 6 | Petar Mitsin | Bulgaria | 3:49.43 | |
| 24 | 5 | 2 | Marco De Tullio | Italy | 3:49.44 | |
| 25 | 4 | 3 | Ahmed Jaouadi | Tunisia | 3:49.85 | |
| 26 | 4 | 1 | Ilia Sibirtsev | Uzbekistan | 3:50.09 | NR |
| 27 | 4 | 7 | Jon Joentvedt | Norway | 3:50.71 | |
| 28 | 4 | 8 | Lorne Wigginton | Canada | 3:50.91 | |
| 29 | 3 | 4 | Carlos Quijada | Spain | 3:52.86 | |
| 30 | 3 | 2 | Glen Lim Jun Wei | Singapore | 3:52.91 | |
| 31 | 4 | 4 | Vlad Stancu | Romania | 3:52.97 | |
| 32 | 3 | 1 | Dylan Porges | Mexico | 3:53.11 | |
| 33 | 3 | 6 | Juan Morales | Colombia | 3:54.22 | |
| 34 | 2 | 5 | Samuel Kostal | Slovakia | 3:54.78 | |
| 35 | 6 | 9 | Logan Fontaine | France | 3:55.60 | |
| 36 | 3 | 3 | Emir Batur Albayrak | Turkey | 3:56.34 | |
| 37 | 3 | 7 | Sašo Boškan | Slovenia | 3:56.38 | |
| 38 | 2 | 4 | Loris Bianchi | San Marino | 3:58.47 | |
| 39 | 3 | 9 | Rafael Ponce | Peru | 3:59.63 | |
| 40 | 4 | 0 | Nguyễn Huy Hoàng | Vietnam | 4:02.13 | |
| 41 | 2 | 3 | Omar Abbass | Syria | 4:03.21 | |
| 42 | 1 | 1 | Matheo Mateos | Paraguay | 4:04.14 | |
| 43 | 2 | 2 | Nikola Ǵuretanoviḱ | North Macedonia | 4:04.76 | |
| 44 | 2 | 0 | Nasir Hussain | Nepal | 4:05.65 | NR |
| 45 | 2 | 9 | Ridhwan Mohamed | Kenya | 4:06.44 | NR |
| 46 | 2 | 6 | Alberto Vega | Costa Rica | 4:06.89 | |
| 47 | 1 | 4 | Xavier Ventura | El Salvador | 4:07.35 | |
| 48 | 2 | 1 | Mal Gashi | Kosovo | 4:08.51 | |
| 49 | 2 | 8 | Liggjas Joensen | Faroe Islands | 4:08.59 | |
| 50 | 3 | 0 | Tonnam Kanteemool | Thailand | 4:09.41 | |
| 51 | 1 | 5 | Khaled Alotaibi | Kuwait | 4:14.64 | |
| 52 | 1 | 7 | Mahmoud Abu Gharbieh | Palestine | 4:15.85 | |
| 53 | 3 | 8 | Ryan Barbe | Morocco | 4:16.08 | |
| 54 | 1 | 6 | Kaeden Gleason | U.S. Virgin Islands | 4:17.52 | |
| 55 | 1 | 3 | Mohammed Al-Zaki | Saudi Arabia | 4:21.18 | |
| 56 | 1 | 2 | Mohamed Shiham | Maldives | 4:31.96 | |
| | 2 | 7 | Gerald Hernández | Nicaragua | Did not start | Did not start |

### Final

The final was started at 19:02.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 3 | Kim Woo-min | South Korea | 3:42.71 | |
| | 4 | Elijah Winnington | Australia | 3:42.86 | |
| | 5 | Lukas Märtens | Germany | 3:42.96 | |
| 4 | 7 | Guilherme Costa | Brazil | 3:44.22 | |
| 5 | 1 | Lucas Henveaux | Belgium | 3:44.61 | NR |
| 6 | 8 | Victor Johansson | Sweden | 3:45.87 | NR |
| 7 | 6 | Daniel Wiffen | Ireland | 3:46.65 | |
| 8 | 2 | Felix Auböck | Austria | 3:51.60 | |