| Event: | Men's 400 metre freestyle |
| Competition: | 2005 FINA World Championships |
| Date: | 24 July 2005 |
| Competitors: | 57 |
| Win Value: | 3:42.91 |
| Gold: | Grant Hackett |
| Goldnoc: | AUS |
| Silver: | Yuri Prilukov |
| Silvernoc: | RUS |
| Bronze: | Oussama Mellouli |
| Bronzenoc: | TUN |
| Prev: | 2003 |
| Next: | 2007 |
See main article: Swimming at the 2005 World Aquatics Championships.
The men's 400 metre freestyle at the 2005 World Aquatics Championships took place on 24 July (heats and final) in the Olympic pool at Parc Jean-Drapeau in Montreal, Canada. 57 swimmers were entered and in the event in the preliminary heats, the top-8 of which advanced on to swim again in the final heat that event.
The existing records at the start of the event were:
3:40.08, Ian Thorpe (Australia), 30 July 2002 in Manchester, UK.
3:40.17, Ian Thorpe (Australia), Fukuoka 2001 (22 July 2001)
| Place | Name | Nationality | Time | Note |
|---|---|---|---|---|
| 1 | 3:42.91 | |||
| 2 | 3:44.44 | |||
| 3 | 3:46.08 | |||
| 4 | 3:46.91 | |||
| 5 | 3:47.16 | |||
| 6 | 3:47.83 | |||
| 7 | 3:48.60 | |||
| 8 | 3:50.51 | |||
| Rank | Name | Nationality | Time | Note |
|---|---|---|---|---|
| 1 | 3:44.63 | Q | ||
| 2 | 3:46.70 | Q, NR | ||
| 3 | 3:47.28 | Q | ||
| 4 | 3:47.48 | Q | ||
| 5 | 3:47.59 | Q | ||
| 6 | 3:48.89 | Q | ||
| 7 | 3:48.93 | Q | ||
| 8 | 3:49.00 | Q | ||
| 9 | 3:49.34 | |||
| 10 | 3:49.55 | |||
| 11 | 3:49.72 | |||
| 12 | 3:49.99 | |||
| 13 | 3:50.15 | |||
| 14 | 3:50.17 | |||
| 15 | 3:50.24 | |||
| 16 | 3:50.33 | |||
| 17 | 3:50.47 | |||
| 18 | 3:50.53 | |||
| 19 | 3:51.88 | |||
| 20 | 3:52.45 | |||
| 21 | 3:52.88 | |||
| 22 | 3:52.92 | |||
| 23 | 3:53.19 | |||
| 24 | 3:54.57 | |||
| 25 | 3:55.35 | |||
| 26 | 3:55.43 | |||
| 27 | 3:55.62 | |||
| 28 | 3:56.26 | |||
| 29 | 3:56.58 | |||
| 30 | 3:57.66 | |||
| 31 | 3:58.20 | |||
| 32 | 3:58.31 | |||
| 33 | 3:58.35 | |||
| 34 | 3:58.74 | |||
| 35 | 3:59.48 | |||
| 36 | 3:59.84 | |||
| 37 | 4:01.01 | |||
| 38 | 4:02.82 | |||
| 39 | 4:03.50 | |||
| 40 | 4:03.92 | |||
| 41 | 4:04.47 | |||
| 42 | 4:04.76 | |||
| 43 | 4:06.72 | |||
| 44 | 4:06.90 | |||
| 45 | 4:07.04 | |||
| 46 | 4:07.64 | |||
| 47 | 4:08.58 | |||
| 48 | 4:10.75 | |||
| 49 | 4:12.18 | |||
| 50 | 4:12.58 | |||
| 51 | 4:13.93 | |||
| 52 | 4:16.44 | |||
| 53 | 4:20.27 | |||
| 54 | 4:20.47 | |||
| 55 | 4:21.43 | |||
| 56 | 4:26.07 | |||
| 57 | 4:46.71 | |||