# 2012 FINA World Swimming Championships (25 m) – Men's 400 metre freestyle

The men's 400 metre freestyle event at the 11th FINA World Swimming Championships (25m) took place 14 December 2012 at the Sinan Erdem Dome.
In June 2013, Danish swimmer Mads Glæsner was stripped of the bronze medal after testing positive for levomethamphetamine.

## Records

Prior to this competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record | Yannick Agnel | France | 3:32.25 | Angers | 15 November 2012 |
| Championship record | Grant Hackett | Australia | 3:35.01 | Hong Kong | 1 April 1999 |
No new records were set during this competition.

## Results
### Heats

| Rank | Heat | Lane | Name | Time | Notes |
| 1 | 6 | 4 | Michael Klueh (USA) | 3:41.07 | Q |
| 2 | 6 | 2 | Ahmed Mathlouthi (TUN) | 3:41.34 | Q |
| 3 | 5 | 5 | Paul Biedermann (GER) | 3:41.40 | Q |
| 4 | 6 | 3 | Matthew Stanley (NZL) | 3:41.59 | Q |
| 5 | 7 | 8 | Anders Lie (DEN) | 3:41.80 | Q |
| 6 | 1 | 7 | Hao Yun (CHN) | 3:42.13 | Q |
| 7 | 5 | 4 | Pál Joensen (FRO) | 3:42.43 | Q |
| 8 | 5 | 3 | Andrea Mitchell D'Arrigo (ITA) | 3:42.49 | |
| 9 | 7 | 0 | Devon Myles Brown (RSA) | 3:42.76 | |
| 10 | 6 | 5 | Gabriele Detti (ITA) | 3:42.97 | |
| 11 | 7 | 3 | Mikhail Polischuk (RUS) | 3:43.05 | |
| 12 | 6 | 6 | Serhiy Frolov (UKR) | 3:43.29 | |
| 13 | 7 | 6 | Alexander Selin (RUS) | 3:43.52 | |
| 14 | 5 | 7 | Ieuan Lloyd (GBR) | 3:43.70 | |
| 15 | 5 | 2 | Jordan Harrison (AUS) | 3:43.88 | |
| 16 | 7 | 5 | Dominik Meichtry (SUI) | 3:44.09 | |
| 17 | 6 | 9 | Ryan Feeley (USA) | 3:44.22 | |
| 18 | 7 | 7 | Jarrod Killey (AUS) | 3:44.46 | |
| 19 | 7 | 2 | Fumiya Hidaka (JPN) | 3:44.56 | |
| 20 | 5 | 0 | Yohei Takiguchi (JPN) | 3:45.77 | |
| 21 | 5 | 6 | Ewan Jackson (NZL) | 3:46.00 | |
| 22 | 6 | 1 | Gergely Gyurta (HUN) | 3:47.19 | |
| 23 | 6 | 8 | Patrik Rakos (HUN) | 3:47.56 | |
| 24 | 4 | 2 | Anton Sveinn McKee (ISL) | 3:47.83 | NR |
| 25 | 7 | 9 | Juan Pereyra (ARG) | 3:48.29 | |
| 26 | 4 | 4 | Nezir Karap (TUR) | 3:48.56 | NR |
| 27 | 4 | 5 | Anton Goncharov (UKR) | 3:48.62 | |
| 28 | 6 | 7 | Anthony Pannier (FRA) | 3:48.70 | |
| 29 | 5 | 1 | Robert Renwick (GBR) | 3:49.17 | |
| 30 | 6 | 0 | Richárd Nagy (SVK) | 3:49.38 | |
| 31 | 4 | 7 | Ediz Yıldırımer (TUR) | 3:49.45 | |
| 32 | 1 | 4 | Uladzimir Zhyharau (BLR) | 3:49.63 | |
| 33 | 1 | 1 | Pu Wenjie (CHN) | 3:49.86 | |
| 34 | 4 | 3 | Arturo Pérez Vertti (MEX) | 3:51.30 | |
| 35 | 1 | 2 | Ensar Hajder (BIH) | 3:51.69 | NR |
| 36 | 4 | 9 | Irakli Revishvili (GEO) | 3:54.56 | |
| 37 | 5 | 9 | Martin Naidich (ARG) | 3:54.76 | |
| 38 | 3 | 3 | Marko Blaževski (MKD) | 3:56.32 | NR |
| 39 | 4 | 6 | Matthew Abeysinghe (SRI) | 3:56.79 | |
| 40 | 4 | 0 | Yeziel Morales (PUR) | 3:57.85 | NR |
| 41 | 4 | 8 | Aleksander Slepchenko (KGZ) | 3:59.58 | |
| 42 | 3 | 0 | Marcelo Alberto Acosta Jimenez (ESA) | 4:00.22 | |
| 43 | 3 | 2 | Welliam Maksi (SYR) | 4:00.62 | |
| 44 | 4 | 1 | Sobitjon Amilov (UZB) | 4:01.31 | |
| 45 | 3 | 6 | Iacovos Hadjiconstantinou (CYP) | 4:01.37 | |
| 46 | 3 | 4 | Khurshidjon Tursunov (UZB) | 4:02.62 | |
| 47 | 3 | 5 | Jesus Monge (PER) | 4:02.94 | |
| 48 | 3 | 8 | Edward Caruana Dingli (MLT) | 4:06.30 | |
| 49 | 2 | 6 | Khader Baqleh (JOR) | 4:10.77 | |
| 50 | 3 | 7 | Christian Selby (BAR) | 4:11.79 | |
| 51 | 2 | 4 | Paul Elaisa (FIJ) | 4:12.16 | |
| 52 | 3 | 1 | Quinton Delie (NAM) | 4:12.61 | NR |
| 53 | 2 | 5 | Adam Viktora (SEY) | 4:15.31 | |
| 54 | 3 | 9 | Fernando Medrano Medina (NCA) | 4:17.66 | |
| 55 | 2 | 3 | Bakr Salam Ali (IRQ) | 4:18.40 | |
| 56 | 2 | 2 | Anderson Lim (BRU) | 4:23.37 | |
| 57 | 2 | 1 | Israr Hussain (PAK) | 4:26.14 | |
| 58 | 2 | 7 | Franc Aleksi (ALB) | 4:31.26 | |
| 59 | 2 | 9 | Sirish Gurung (NEP) | 4:37.41 | |
| 60 | 2 | 0 | Noah Al-Khulaifi (QAT) | 4:37.59 | |
| 61 | 2 | 8 | Farhan Farhan (BHR) | 4:46.60 | |
| — | 1 | 3 | Nikolas Sylvester (VIN) | DNF | |
| — | 1 | 5 | Storm Halbich (VIN) | DNF | |
| — | 1 | 6 | Alejandro Gómez (VEN) | DNS | |
| — | 5 | 8 | Mateusz Sawrymowicz (POL) | DNS | |
| — | 7 | 1 | Filip Zaborowski (POL) | DNS | |
| — | 7 | 4 | Mads Glæsner (DEN) | 3:40.89 | DQ |

### Final

The final was held at 19:55.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 6 | Paul Biedermann | Germany | 3:39.15 | |
| | 1 | Hao Yun | China | 3:39.48 | |
| | 2 | Matthew Stanley | New Zealand | 3:41.01 | |
| 4 | 5 | Michael Klueh | United States | 3:41.29 | |
| 5 | 8 | Pál Joensen | Faroe Islands | 3:42.23 | |
| 6 | 3 | Ahmed Mathlouthi | Tunisia | 3:42.48 | |
| 7 | 7 | Anders Lie | Denmark | 3:42.80 | |
| — | 4 | Mads Glæsner | Denmark | 3:40.09 | DQ |