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.Results
Heats
The heats were held at 09:48.| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 4 | Sun Yang | 3:44.99 | Q | |
| 2 | 6 | 5 | James Guy | 3:45.37 | Q | |
| 3 | 6 | 6 | Ryan Cochrane | 3:45.86 | Q | |
| 4 | 7 | 3 | Connor Jaeger | 3:46.03 | Q | |
| 5 | 4 | 4 | Wojciech Wojdak | 3:46.67 | Q | |
| 6 | 6 | 7 | Michael McBroom | 3:46.69 | Q | |
| 7 | 7 | 1 | Péter Bernek | 3:46.83 | Q | |
| 8 | 6 | 1 | Clemens Rapp | 3:47.19 | Q | |
| 9 | 6 | 2 | Florian Vogel | 3:47.34 | ||
| 10 | 7 | 5 | David McKeon | 3:47.36 | ||
| 11 | 7 | 4 | Mack Horton | 3:47.37 | ||
| 12 | 5 | 9 | Filip Zaborowski | 3:47.59 | ||
| 13 | 6 | 9 | Henrik Christiansen | 3:47.71 | ||
| 14 | 7 | 6 | Nicholas Grainger | 3:47.95 | ||
| 15 | 5 | 2 | Ahmed Akram | 3:48.07 | NR | |
| 16 | 5 | 8 | Marwan El-Kamash | 3:48.15 | ||
| 17 | 7 | 9 | Mads Glæsner | 3:48.78 | ||
| 18 | 7 | 2 | Myles Brown | 3:48.86 | ||
| 19 | 6 | 3 | Velimir Stjepanović | 3:49.49 | ||
| 20 | 5 | 1 | Felix Auböck | 3:50.04 | ||
| 21 | 4 | 8 | Nezir Karap | 3:50.07 | ||
| 21 | 5 | 5 | Miguel Durán | 3:50.07 | ||
| 23 | 5 | 4 | Jeremy Bagshaw | 3:50.54 | ||
| 24 | 3 | 4 | Cristian Quintero | 3:50.89 | ||
| 25 | 7 | 0 | Damien Joly | 3:50.89 | ||
| 26 | 4 | 6 | Li Yunqi | 3:51.30 | ||
| 27 | 7 | 7 | Andrea Mitchell D'Arrigo | 3:51.31 | ||
| 28 | 3 | 3 | Martin Bau | 3:51.44 | ||
| 29 | 4 | 1 | Marcelo Acosta | 3:51.45 | ||
| 30 | 5 | 0 | Ahmed Mathlouthi | 3:51.46 | ||
| 31 | 4 | 5 | Lander Hendrickx | 3:51.61 | ||
| 32 | 3 | 2 | Richárd Nagy | 3:51.63 | ||
| 33 | 5 | 7 | David Brandl | 3:51.83 | ||
| 34 | 5 | 6 | Aleksandr Krasnykh | 3:51.93 | ||
| 35 | 6 | 0 | Tsubasa Amai | 3:52.06 | ||
| 36 | 4 | 9 | Ido Haber | 3:52.08 | NR | |
| 37 | 7 | 8 | Ferry Weertman | 3:52.18 | ||
| 38 | 3 | 5 | Martin Naidich | 3:52.43 | ||
| 39 | 5 | 3 | Mykhailo Romanchuk | 3:52.76 | ||
| 40 | 4 | 7 | Matias Koski | 3:52.86 | ||
| 41 | 2 | 2 | Christian Bayo | 3:53.61 | ||
| 42 | 4 | 3 | Serhiy Frolov | 3:53.64 | ||
| 43 | 6 | 8 | Jan Micka | 3:53.79 | ||
| 44 | 4 | 0 | Jean-Baptiste Febo | 3:54.47 | ||
| 45 | 2 | 6 | Sven Arnar Saemundsson | 3:55.43 | ||
| 46 | 3 | 7 | Alexei Sancov | 3:55.83 | ||
| 47 | 4 | 2 | Matthew Stanley | 3:56.71 | ||
| 48 | 3 | 6 | Mateo de Angulo | 3:57.01 | ||
| 49 | 3 | 0 | Tomas Peribonio | 3:57.21 | ||
| 50 | 3 | 1 | Yeo Kai Quan | 3:57.44 | ||
| 51 | 2 | 5 | Alin Artimon | 3:57.79 | ||
| 52 | 1 | 5 | Khader Baqlah | 3:58.71 | ||
| 53 | 2 | 4 | Welson Sim | 3:58.75 | ||
| 54 | 2 | 0 | Irakli Revishvili | 4:00.68 | ||
| 55 | 2 | 8 | Luis Ventura | 4:00.79 | ||
| 56 | 2 | 1 | Tanakrit Kittiya | 4:01.59 | ||
| 57 | 3 | 8 | Jessie Lacuna | 4:01.61 | ||
| 58 | 2 | 3 | Raphaël Stacchiotti | 4:01.63 | ||
| 59 | 2 | 7 | Ensar Hajder | 4:02.41 | ||
| 60 | 3 | 9 | Saurabh Sangvekar | 4:02.57 | ||
| 61 | 2 | 9 | Alex Sobers | 4:05.07 | ||
| 62 | 1 | 4 | Iacovos Hadjiconstantinou | 4:06.38 | ||
| 63 | 1 | 3 | Geoffrey Butler | 4:07.41 | ||
| 64 | 1 | 7 | Klavio Meca | 4:08.18 | ||
| 65 | 1 | 6 | Ahmed Gebrel | 4:09.97 | ||
| 66 | 1 | 2 | Brandon Schuster | 4:15.30 | ||
| 67 | 1 | 1 | Haris Bandey | 4:31.90 | ||
| 68 | 1 | 8 | Andrianirina Lalanomena | 4:49.08 |
Final
The final was held at 17:42.| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Sun Yang | 3:42.58 | |||
| 5 | James Guy | 3:43.75 | NR | ||
| 3 | Ryan Cochrane | 3:44.59 | |||
| 4 | 6 | Connor Jaeger | 3:44.81 | ||
| 5 | 1 | Péter Bernek | 3:46.29 | ||
| 6 | 2 | Wojciech Wojdak | 3:46.81 | ||
| 7 | 8 | Clemens Rapp | 3:48.52 | ||
| 8 | 7 | Michael McBroom | 3:51.94 |