# Swimming at the 2019 World Aquatics Championships – Men's 400 metre freestyle

The Men's 400 metre freestyle competition at the 2019 World Championships was held on 21 July 2019. The three-time defending champion was Sun Yang, and he successfully defended his title for a record-breaking 4th consecutive victory in the world championships in this event. He became the third man to win an event 4 times at the world championships after Grant Hackett in the 1500 meter freestyle and Ryan Lochte in the 200 meter individual medley.

## 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 10:16.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | 4 | Sun Yang | China | 3:44.10 | Q |
| 2 | 5 | 5 | Danas Rapšys | Lithuania | 3:44.31 | Q |
| 3 | 5 | 3 | Jack McLoughlin | Australia | 3:44.79 | Q |
| 4 | 4 | 4 | Gabriele Detti | Italy | 3:45.49 | Q |
| 5 | 4 | 5 | Mack Horton | Australia | 3:45.51 | Q |
| 6 | 4 | 3 | Zane Grothe | United States | 3:45.83 | Q |
| 7 | 5 | 2 | Marco De Tullio | Italy | 3:45.99 | Q |
| 8 | 4 | 1 | Ji Xinjie | China | 3:46.34 | Q |
| 9 | 5 | 6 | Aleksandr Krasnykh | Russia | 3:46.65 | |
| 10 | 5 | 7 | Henrik Christiansen | Norway | 3:46.99 | |
| 11 | 4 | 6 | Martin Malyutin | Russia | 3:47.43 | |
| 12 | 4 | 8 | Anton Ipsen | Denmark | 3:48.50 | |
| 13 | 4 | 7 | Felix Auböck | Austria | 3:48.78 | |
| 14 | 5 | 8 | Wojciech Wojdak | Poland | 3:48.81 | |
| 15 | 4 | 9 | Luiz Altamir Melo | Brazil | 3:48.87 | |
| 16 | 3 | 6 | Dimitrios Negris | Greece | 3:50.81 | |
| 17 | 5 | 1 | Daniel Jervis | Great Britain | 3:50.90 | |
| 18 | 3 | 5 | Zac Reid | New Zealand | 3:51.25 | |
| 19 | 3 | 7 | Kregor Zirk | Estonia | 3:51.30 | NR |
| 20 | 5 | 9 | Antonio Djakovic | Switzerland | 3:51.51 | |
| 21 | 2 | 4 | Khader Baqlah | Jordan | 3:51.59 | NR |
| 22 | 5 | 0 | Lee Ho-joon | South Korea | 3:51.89 | |
| 23 | 4 | 0 | Marwan El-Kamash | Egypt | 3:52.51 | |
| 24 | 3 | 4 | Welson Sim | Malaysia | 3:52.85 | |
| 25 | 4 | 2 | Grant Shoults | United States | 3:52.96 | |
| 26 | 3 | 8 | Richard Nagy | Slovakia | 3:53.38 | |
| 27 | 2 | 6 | Erge Can Gezmiş | Turkey | 3:54.01 | |
| 28 | 3 | 2 | Denis Loktev | Israel | 3:54.53 | |
| 29 | 2 | 7 | Igor Mogne | Mozambique | 3:54.90 | |
| 30 | 2 | 5 | Cheuk Ming Ho | Hong Kong | 3:55.05 | |
| 31 | 3 | 3 | Marcelo Acosta | El Salvador | 3:55.06 | |
| 32 | 2 | 1 | Christian Bayo | Puerto Rico | 3:55.33 | |
| 33 | 3 | 1 | Nguyễn Hữu Kim Sơn | Vietnam | 3:55.59 | |
| 34 | 3 | 9 | Glen Lim Jun Wei | Singapore | 3:55.60 | |
| 35 | 2 | 2 | Wesley Roberts | Cook Islands | 3:58.12 | |
| 36 | 2 | 8 | Alex Sobers | Barbados | 3:58.97 | |
| 37 | 2 | 0 | Kushagra Rawat | India | 3:59.39 | |
| 38 | 3 | 0 | Aflah Prawira | Indonesia | 3:59.98 | |
| 39 | 2 | 3 | James Freeman | Botswana | 4:00.48 | |
| 40 | 1 | 5 | Daniel Jacobs | Aruba | 4:00.69 | |
| 41 | 2 | 9 | Irakli Revishvili | Georgia | 4:00.88 | |
| 42 | 1 | 3 | Christian Mayer | Peru | 4:05.33 | |
| 43 | 1 | 6 | Adib Khalil | Lebanon | 4:06.70 | |
| 44 | 1 | 7 | Franci Aleksi | Albania | 4:07.39 | |
| 45 | 1 | 2 | Filip Derkoski | North Macedonia | 4:07.99 | |
| 46 | 1 | 1 | Mawupemon Otogbe | Togo | 4:25.30 | |
| — | 1 | 4 | Omar Abbas | Syria | DSQ | DSQ |

### Final

The final was held at 20:02.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Sun Yang | China | 3:42.44 | |
| | 2 | Mack Horton | Australia | 3:43.17 | |
| | 6 | Gabriele Detti | Italy | 3:43.23 | NR |
| 4 | 5 | Danas Rapšys | Lithuania | 3:43.50 | |
| 5 | 1 | Marco De Tullio | Italy | 3:44.86 | |
| 6 | 3 | Jack McLoughlin | Australia | 3:45.19 | |
| 7 | 8 | Ji Xinjie | China | 3:45.64 | |
| 8 | 7 | Zane Grothe | United States | 3:45.78 | |