# Swimming at the 2015 World Aquatics Championships – Men's 400 metre freestyle

The men's 400 metre freestyle competition of the swimming events at the 2015 World Aquatics Championships was held on 2 August with the heats and the final.

## 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 held at 09:48.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 4 | Sun Yang | China | 3:44.99 | Q |
| 2 | 6 | 5 | James Guy | Great Britain | 3:45.37 | Q |
| 3 | 6 | 6 | Ryan Cochrane | Canada | 3:45.86 | Q |
| 4 | 7 | 3 | Connor Jaeger | United States | 3:46.03 | Q |
| 5 | 4 | 4 | Wojciech Wojdak | Poland | 3:46.67 | Q |
| 6 | 6 | 7 | Michael McBroom | United States | 3:46.69 | Q |
| 7 | 7 | 1 | Péter Bernek | Hungary | 3:46.83 | Q |
| 8 | 6 | 1 | Clemens Rapp | Germany | 3:47.19 | Q |
| 9 | 6 | 2 | Florian Vogel | Germany | 3:47.34 | |
| 10 | 7 | 5 | David McKeon | Australia | 3:47.36 | |
| 11 | 7 | 4 | Mack Horton | Australia | 3:47.37 | |
| 12 | 5 | 9 | Filip Zaborowski | Poland | 3:47.59 | |
| 13 | 6 | 9 | Henrik Christiansen | Norway | 3:47.71 | |
| 14 | 7 | 6 | Nicholas Grainger | Great Britain | 3:47.95 | |
| 15 | 5 | 2 | Ahmed Akram | Egypt | 3:48.07 | NR |
| 16 | 5 | 8 | Marwan El-Kamash | Egypt | 3:48.15 | |
| 17 | 7 | 9 | Mads Glæsner | Denmark | 3:48.78 | |
| 18 | 7 | 2 | Myles Brown | South Africa | 3:48.86 | |
| 19 | 6 | 3 | Velimir Stjepanović | Serbia | 3:49.49 | |
| 20 | 5 | 1 | Felix Auböck | Austria | 3:50.04 | |
| 21 | 4 | 8 | Nezir Karap | Turkey | 3:50.07 | |
| 21 | 5 | 5 | Miguel Durán | Spain | 3:50.07 | |
| 23 | 5 | 4 | Jeremy Bagshaw | Canada | 3:50.54 | |
| 24 | 3 | 4 | Cristian Quintero | Venezuela | 3:50.89 | |
| 25 | 7 | 0 | Damien Joly | France | 3:50.89 | |
| 26 | 4 | 6 | Li Yunqi | China | 3:51.30 | |
| 27 | 7 | 7 | Andrea Mitchell D'Arrigo | Italy | 3:51.31 | |
| 28 | 3 | 3 | Martin Bau | Slovenia | 3:51.44 | |
| 29 | 4 | 1 | Marcelo Acosta | El Salvador | 3:51.45 | |
| 30 | 5 | 0 | Ahmed Mathlouthi | Tunisia | 3:51.46 | |
| 31 | 4 | 5 | Lander Hendrickx | Belgium | 3:51.61 | |
| 32 | 3 | 2 | Richárd Nagy | Slovakia | 3:51.63 | |
| 33 | 5 | 7 | David Brandl | Austria | 3:51.83 | |
| 34 | 5 | 6 | Aleksandr Krasnykh | Russia | 3:51.93 | |
| 35 | 6 | 0 | Tsubasa Amai | Japan | 3:52.06 | |
| 36 | 4 | 9 | Ido Haber | Israel | 3:52.08 | NR |
| 37 | 7 | 8 | Ferry Weertman | Netherlands | 3:52.18 | |
| 38 | 3 | 5 | Martin Naidich | Argentina | 3:52.43 | |
| 39 | 5 | 3 | Mykhailo Romanchuk | Ukraine | 3:52.76 | |
| 40 | 4 | 7 | Matias Koski | Finland | 3:52.86 | |
| 41 | 2 | 2 | Christian Bayo | Puerto Rico | 3:53.61 | |
| 42 | 4 | 3 | Serhiy Frolov | Ukraine | 3:53.64 | |
| 43 | 6 | 8 | Jan Micka | Czech Republic | 3:53.79 | |
| 44 | 4 | 0 | Jean-Baptiste Febo | Switzerland | 3:54.47 | |
| 45 | 2 | 6 | Sven Arnar Saemundsson | Croatia | 3:55.43 | |
| 46 | 3 | 7 | Alexei Sancov | Moldova | 3:55.83 | |
| 47 | 4 | 2 | Matthew Stanley | New Zealand | 3:56.71 | |
| 48 | 3 | 6 | Mateo de Angulo | Colombia | 3:57.01 | |
| 49 | 3 | 0 | Tomas Peribonio | Ecuador | 3:57.21 | |
| 50 | 3 | 1 | Yeo Kai Quan | Singapore | 3:57.44 | |
| 51 | 2 | 5 | Alin Artimon | Romania | 3:57.79 | |
| 52 | 1 | 5 | Khader Baqlah | Jordan | 3:58.71 | |
| 53 | 2 | 4 | Welson Sim | Malaysia | 3:58.75 | |
| 54 | 2 | 0 | Irakli Revishvili | Georgia | 4:00.68 | |
| 55 | 2 | 8 | Luis Ventura | Mexico | 4:00.79 | |
| 56 | 2 | 1 | Tanakrit Kittiya | Thailand | 4:01.59 | |
| 57 | 3 | 8 | Jessie Lacuna | Philippines | 4:01.61 | |
| 58 | 2 | 3 | Raphaël Stacchiotti | Luxembourg | 4:01.63 | |
| 59 | 2 | 7 | Ensar Hajder | Bosnia and Herzegovina | 4:02.41 | |
| 60 | 3 | 9 | Saurabh Sangvekar | India | 4:02.57 | |
| 61 | 2 | 9 | Alex Sobers | Barbados | 4:05.07 | |
| 62 | 1 | 4 | Iacovos Hadjiconstantinou | Cyprus | 4:06.38 | |
| 63 | 1 | 3 | Geoffrey Butler | Cayman Islands | 4:07.41 | |
| 64 | 1 | 7 | Klavio Meca | Albania | 4:08.18 | |
| 65 | 1 | 6 | Ahmed Gebrel | Palestine | 4:09.97 | |
| 66 | 1 | 2 | Brandon Schuster | Samoa | 4:15.30 | |
| 67 | 1 | 1 | Haris Bandey | Pakistan | 4:31.90 | |
| 68 | 1 | 8 | Andrianirina Lalanomena | Madagascar | 4:49.08 | |

### Final

The final was held at 17:42.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Sun Yang | China | 3:42.58 | |
| | 5 | James Guy | Great Britain | 3:43.75 | NR |
| | 3 | Ryan Cochrane | Canada | 3:44.59 | |
| 4 | 6 | Connor Jaeger | United States | 3:44.81 | |
| 5 | 1 | Péter Bernek | Hungary | 3:46.29 | |
| 6 | 2 | Wojciech Wojdak | Poland | 3:46.81 | |
| 7 | 8 | Clemens Rapp | Germany | 3:48.52 | |
| 8 | 7 | Michael McBroom | United States | 3:51.94 | |