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

The 400 metre individual medley competition of the swimming events at the 2015 World Aquatics Championships was held on 9 August with the heats and the final.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Michael Phelps (USA) | 4:03.84 | Beijing, China | 10 August 2008 |
| Competition record | Michael Phelps (USA) | 4:06.22 | Melbourne, Australia | 1 April 2007 |

## Results
### Heats

The heats were held at 09:30.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 4 | Chase Kalisz | United States | 4:11.83 | Q |
| 2 | 4 | 3 | Dávid Verrasztó | Hungary | 4:11.99 | Q |
| 3 | 5 | 5 | Daiya Seto | Japan | 4:12.17 | Q |
| 4 | 5 | 4 | Tyler Clary | United States | 4:12.22 | Q |
| 5 | 5 | 3 | Daniel Wallace | Great Britain | 4:13.07 | Q |
| 6 | 5 | 7 | Jacob Heidtmann | Germany | 4:13.62 | Q |
| 7 | 4 | 7 | Roberto Pavoni | Great Britain | 4:13.91 | Q |
| 8 | 5 | 2 | Yang Zhixian | China | 4:15.47 | Q |
| 9 | 4 | 2 | Federico Turrini | Italy | 4:15.70 | |
| 10 | 4 | 5 | Thomas Fraser-Holmes | Australia | 4:15.93 | |
| 11 | 3 | 4 | Aleksandr Osipenko | Russia | 4:16.35 | |
| 12 | 3 | 5 | Richárd Nagy | Slovakia | 4:16.37 | |
| 13 | 5 | 1 | Benjámin Grátz | Hungary | 4:16.69 | |
| 14 | 4 | 8 | Gal Nevo | Israel | 4:17.34 | |
| 15 | 5 | 8 | Kevin Wedel | Germany | 4:17.42 | |
| 16 | 3 | 2 | Jérémy Desplanches | Switzerland | 4:17.90 | NR |
| 17 | 4 | 0 | Semen Makovich | Russia | 4:18.61 | |
| 18 | 3 | 3 | Diogo Carvalho | Portugal | 4:18.67 | |
| 19 | 5 | 6 | Huang Chaosheng | China | 4:19.11 | |
| 20 | 3 | 1 | Jakub Maly | Austria | 4:19.20 | |
| 21 | 4 | 6 | Sebastien Rousseau | South Africa | 4:20.16 | |
| 22 | 3 | 6 | Pavel Janeček | Czech Republic | 4:20.43 | |
| 23 | 3 | 7 | Carlos Omaña | Venezuela | 4:20.74 | |
| 24 | 4 | 1 | Marc Sánchez | Spain | 4:21.26 | |
| 25 | 1 | 4 | Henrik Christiansen | Norway | 4:21.67 | |
| 26 | 5 | 0 | Alexis Santos | Portugal | 4:22.35 | |
| 27 | 2 | 7 | Alpkan Örnek | Turkey | 4:22.72 | |
| 28 | 5 | 9 | Nathan Capp | New Zealand | 4:23.00 | |
| 29 | 1 | 5 | Ahmed Hamdy | Egypt | 4:23.02 | |
| 30 | 3 | 8 | Christoph Meier | Liechtenstein | 4:23.57 | |
| 31 | 2 | 5 | Pedro Pinotes | Angola | 4:23.85 | |
| 32 | 2 | 1 | Robert Žbogar | Slovenia | 4:25.10 | |
| 33 | 2 | 0 | Marko Blaževski | North Macedonia | 4:25.57 | |
| 34 | 3 | 0 | Uvis Kalniņš | Latvia | 4:26.17 | |
| 35 | 2 | 8 | Trần Duy Khôi | Vietnam | 4:27.43 | |
| 36 | 1 | 6 | Luis Vega Torres | Cuba | 4:29.57 | |
| 36 | 2 | 4 | Wen Ren-hau | Chinese Taipei | 4:29.57 | |
| 38 | 2 | 6 | Pang Sheng Jun | Singapore | 4:29.61 | |
| 39 | 2 | 2 | Nikola Dimitrov | Bulgaria | 4:30.78 | |
| 40 | 1 | 7 | Alvi Hjelm | Faroe Islands | 4:33.15 | NR |
| 41 | 1 | 2 | Esteban Araya | Costa Rica | 4:40.23 | |
| | 1 | 3 | Luis Ventura | Mexico | | DNS |
| | 2 | 3 | Ahmed Mathlouthi | Tunisia | | DNS |
| | 2 | 9 | Christian Punter | Puerto Rico | | DNS |
| | 3 | 9 | Raphaël Stacchiotti | Luxembourg | | DNS |
| | 4 | 9 | Thiago Simon | Brazil | | DNS |

### Final

The final was held at 17:47.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 3 | Daiya Seto | Japan | 4:08.50 | |
| | 5 | Dávid Verrasztó | Hungary | 4:09.90 | |
| | 4 | Chase Kalisz | United States | 4:10.05 | |
| 4 | 6 | Tyler Clary | United States | 4:11.71 | |
| 5 | 7 | Jacob Heidtmann | Germany | 4:12.08 | NR |
| 6 | 2 | Daniel Wallace | Great Britain | 4:13.77 | |
| 7 | 1 | Roberto Pavoni | Great Britain | 4:13.81 | |
| 8 | 8 | Yang Zhixian | China | 4:16.74 | |