2012 IAAF World Indoor Championships – Men's 400 metres
The men's 400 metres at the 2012 IAAF World Indoor Championships took place March 9 and 10 at the Ataköy Athletics Arena. The final was won by Costa Rican Nery Brenes in a time of 45.11.
Doping disqualification
of Sudan, who ran the heat and the semifinal, retrospectively got his results disqualified for doping.Medalists
Records
Qualification standards
Schedule
Results
Heats
Qualification: First 2 and the 6 fastest times qualified. 32 athletes from 27 countries participated.| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 1 | Demetrius Pinder | 46.49 | Q | |
| 2 | 2 | Kirani James | 46.64 | Q | |
| 3 | 1 | Tabarie Henry | 46.71 | Q, SB | |
| 4 | 2 | Nery Brenes | 46.77 | Q, SB | |
| 5 | 5 | Pavel Maslák | 47.00 | Q | |
| 6 | 5 | Richard Buck | 47.05 | Q | |
| 7 | 1 | Mark Ujakpor | 47.06 | q | |
| 8 | 2 | Luguelín Santos | 47.07 | q, PB | |
| 9 | 6 | Chris Brown | 47.28 | Q | |
| 2 | Rabah Yousif | q | |||
| 10 | 6 | Calvin Smith Jr. | 47.46 | Q | |
| 11 | 6 | Ali Ekber Kayaş | 47.55 | q | |
| 12 | 3 | Nigel Levine | 47.56 | Q | |
| 13 | 4 | Gil Roberts | 47.57 | Q | |
| 14 | 5 | Erison Hurtault | 47.63 | q | |
| 15 | 4 | Valentin Kruglyakov | 47.70 | Q | |
| 16 | 2 | Maksim Aleksandrenko | 47.78 | q | |
| 17 | 4 | Jarrin Solomon | 47.82 | ||
| 18 | 6 | Nika Kartavtsevi | 48.27 | PB | |
| 19 | 3 | Lorenzo Valentini | 48.58 | Q | |
| 20 | 1 | Wala Gime | 48.85 | ||
| 21 | 5 | Trausti Stefánsson | 48.86 | ||
| 22 | 4 | Takeshi Fujiwara | 48.96 | SB | |
| 23 | 3 | Bacar Houmadi Jannot | 49.58 | ||
| 24 | 4 | Kristijan Efremov | 50.23 | ||
| 25 | 5 | Ak. Hafiy Tajuddin Rositi | 51.02 | NR | |
| 26 | 1 | Yaovi Michael Gougou | 51.20 | NR | |
| 27 | 6 | Bahaa Al Farra | 51.65 | NR | |
| 28 | 3 | Andrés Silva | 51.93 | SB | |
| 29 | 6 | Jeofry Limtiaco | 53.67 | PB | |
| 30 | 5 | Hussein Al-Fedheili | 55.15 | PB | |
| 3 | Lalonde Gordon |
Semifinals
Qualification: First 2 of each heat qualified. 18 athletes from 14 countries participated.| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 1 | Demetrius Pinder | 45.94 | Q | |
| 2 | 1 | Tabarie Henry | 46.01 | Q | |
| 2 | 3 | Nery Brenes | 46.01 | NR, Q | |
| 4 | 3 | Kirani James | 46.04 | Q | |
| 5 | 2 | Chris Brown | 46.37 | Q | |
| 6 | 3 | Nigel Levine | 46.46 | ||
| 7 | 2 | Pavel Maslák | 46.49 | Q | |
| 8 | 2 | Richard Buck | 46.68 | ||
| 9 | 3 | Luguelín Santos | 46.83 | PB | |
| 10 | 1 | Mark Ujakpor | 46.98 | ||
| 11 | 1 | Gil Roberts | 47.01 | ||
| 12 | 2 | Calvin Smith Jr. | 47.09 | ||
| 13 | 3 | Valentin Kruglyakov | 47.34 | ||
| 14 | 2 | Ali Ekber Kayaş | 48.16 | ||
| 15 | 1 | Lorenzo Valentini | 48.47 | ||
| 16 | 3 | Erison Hurtault | 48.68 | ||
| 17 | 1 | Maksim Aleksandrenko | 49.76 | ||
| 2 | Rabah Yousif |
Final
6 athletes from 5 countries participated. The final started at 19:31.| Rank | Name | Nationality | Time | Notes |
| Nery Brenes | 45.11 | CR, NR | ||
| Demetrius Pinder | 45.34 | SB | ||
| Chris Brown | 45.90 | SB | ||
| 4 | Tabarie Henry | 45.96 | SB | |
| 5 | Pavel Maslák | 46.19 | ||
| 6 | Kirani James | 46.21 |