# Swimming at the 2003 World Aquatics Championships – Men's 400 metre freestyle

The Men's 400 Freestyle event at the 10th FINA World Aquatics Championships swam on 20 July 2003 in Barcelona, Spain.
Prior to the start of the event, the existing World (WR) and Championship (CR) records were:
* WR: 3:40.08 swum by Ian Thorpe (Australia) on 30 July 2002 in Manchester, UK
* CR: 3:40.17 swum by Ian Thorpe (Australia) on 22 July 2001 in Fukuoka, Japan

## Results
### Final

| Place | Swimmer | Nation | Time |
| 1 | Ian Thorpe | Australia | 3:42.58 |
| 2 | Grant Hackett | Australia | 3:45.11 |
| 3 | Dragoș Coman | Romania | 3:46.87 |
| 4 | Massimiliano Rosolino | Italy | 3:47.44 |
| 5 | Klete Keller | United States | 3:47.70 |
| 6 | Yuri Prilukov | Russia | 3:48.50 |
| 7 | Chad Carvin | United States | 3:50.36 |
| 8 | Graeme Smith | United Kingdom | 3:51.83 |

### Preliminaries

| Rank | Heat | Lane | Swimmer | Nation | Time | Notes |
| 1 | 8 | 4 | Ian Thorpe | Australia | 3:47.44 | q |
| 2 | 7 | 4 | Grant Hackett | Australia | 3:48.35 | q |
| 3 | 8 | 3 | Yuri Prilukov | Russia | 3:48.49 | q |
| 4 | 7 | 5 | Massimiliano Rosolino | Italy | 3:49.59 | q |
| 5 | 8 | 5 | Klete Keller | United States | 3:49.85 | q |
| 6 | 7 | 3 | Graeme Smith | United Kingdom | 3:49.92 | q |
| 7 | 6 | 3 | Chad Carvin | United States | 3:50.28 | q |
| 8 | 6 | 5 | Dragoș Coman | Romania | 3:50.29 | q |
| 9 | 6 | 7 | Oussama Mellouli | Tunisia | 3:52.04 | |
| 10 | 8 | 8 | Sergiy Fesenko | Ukraine | 3:52.24 | |
| 11 | 7 | 7 | Nikolaos Xylouris | Greece | 3:52.34 | |
| 12 | 8 | 2 | Nicolas Rostoucher | France | 3:52.53 | |
| 13 | 6 | 1 | Alexey Filipets | Russia | 3:52.93 | |
| 14 | 6 | 2 | Mark Johnston | Canada | 3:53.06 | |
| 14 | 8 | 6 | Rick Say | Canada | 3:53.06 | |
| 16 | 6 | 4 | Emiliano Brembilla | Italy | 3:53.43 | |
| 17 | 7 | 6 | Athanasios Oikonomou | Greece | 3:54.17 | |
| 18 | 8 | 1 | Przemysław Stańczyk | Poland | 3:54.68 | |
| 19 | 7 | 2 | David Davies | United Kingdom | 3:54.70 | |
| 20 | 7 | 8 | Dzmitry Koptur | Belarus | 3:54.87 | |
| 21 | 4 | 8 | Bojan Zdešar | Slovenia | 3:55.07 | |
| 22 | 6 | 6 | Shunichi Fujita | Japan | 3:55.13 | |
| 23 | 5 | 1 | Lin Zhang | China | 3:55.41 | |
| 24 | 8 | 7 | Ihor Chervynskyi | Ukraine | 3:55.81 | |
| 25 | 6 | 8 | Shai Livnat | Israel | 3:56.33 | |
| 26 | 5 | 3 | Shilo Ayalon | Israel | 3:57.79 | |
| 27 | 5 | 8 | Gian Carlo Zolezzi | Chile | 3:57.92 | |
| 28 | 5 | 6 | Luis Monteiro | Portugal | 3:58.57 | |
| 29 | 5 | 5 | Felipe Araujo | Brazil | 3:58.74 | |
| 30 | 5 | 2 | Bruno Bonfim | Brazil | 3:59.57 | |
| 31 | 7 | 1 | Cheng Yu | China | 3:59.93 | |
| 32 | 5 | 4 | Erwin Maldonado | Venezuela | 4:00.47 | |
| 33 | 4 | 5 | Victor Rogut | Moldova | 4:01.46 | |
| 34 | 3 | 4 | Cameron Gibson | New Zealand | 4:02.87 | |
| 35 | 4 | 4 | Raouf Benabid | Algeria | 4:02.99 | |
| 36 | 4 | 3 | Juan Pablo Valdivieso | Peru | 4:03.83 | |
| 37 | 3 | 6 | Anovar Bennaceur | Tunisia | 4:04.32 | |
| 38 | 3 | 5 | Dean Kent | New Zealand | 4:04.60 | |
| 39 | 3 | 1 | Igor Erhartic | Yugoslavia | 4:05.38 | |
| 40 | 3 | 7 | Yi-Khy Saw | Malaysia | 4:05.87 | |
| 41 | 5 | 7 | Gerry Strasser | Switzerland | 4:06.94 | |
| 42 | 4 | 1 | Emanuele Nicolini | San Marino | 4:08.35 | |
| 43 | 3 | 2 | Kwok Leung Chung | Hong Kong | 4:08.49 | |
| 44 | 2 | 4 | Timur Irgashev | Uzbekistan | 4:09.83 | |
| 45 | 2 | 3 | Jonathan Mauri | Costa Rica | 4:11.13 | |
| 46 | 3 | 3 | Mohammad Naeem Masri | Syria | 4:11.49 | |
| 47 | 4 | 7 | Petr Vasilev | Uzbekistan | 4:11.54 | |
| 48 | 3 | 8 | Carlos Castro | Chile | 4:11.68 | |
| 49 | 2 | 6 | Youssef Hafdi | Morocco | 4:12.70 | |
| 50 | 2 | 2 | Rehan Poncha | India | 4:14.22 | |
| 51 | 4 | 6 | Ronald Cowen | Bermuda | 4:14.39 | |
| 52 | 2 | 1 | Rony Bakale | Republic of the Congo | 4:23.67 | |
| 53 | 1 | 6 | Seung Gin Lee | Northern Mariana Islands | 4:25.25 | |
| 54 | 1 | 5 | Neil Agius | Malta | 4:25.44 | |
| 55 | 1 | 4 | Anas Samir Abo Yousif | Qatar | 4:26.27 | |
| 56 | 1 | 3 | Mumtaz Ahmed | Pakistan | 4:30.26 | |
| 57 | 2 | 5 | Vasilii Danilov | Kyrgyzstan | 4:30.52 | |
| 58 | 1 | 2 | Steven Mangroo | Seychelles | 4:31.41 | |
| 58 | 2 | 7 | Sergey Dyachkov | Azerbaijan | 4:31.41 | |
| 60 | 2 | 8 | Barnsley Albert | Seychelles | 4:31.51 | |
| – | – | - | Mihail Alexandrov | Bulgaria | DNS | |
| – | – | - | Trevor Kakunze | Burundi | DNS | |