2011 Asian Athletics Championships – Men's 400 metres
The men's 400 metres at the 2011 Asian Athletics Championships was held at the Kobe Universiade Memorial Stadium on the 7 and 8 of July.
Medalists
Records
Results
Round 1
First 2 in each heat and 2 best performers advanced to the Final.| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 3 | Ahmed Al-Marjibi | 46.06 | Q | |
| 2 | 2 | Hideyuki Hirose | 46.35 | Q | |
| 3 | 3 | Yousef Ahmed Masrahi | 46.47 | Q | |
| 4 | 3 | Yusuke Ishitsuka | 46.58 | q | |
| 5 | 3 | Sajjad Hashemiahangari | 46.79 | q | |
| 6 | 1 | Yuzo Kanemaru | 46.84 | Q | |
| 7 | 2 | Park Bong-Go | 46.97 | Q | |
| 8 | 1 | Ismail Al-Sabani | 47.30 | Q | |
| 9 | 1 | Prasanna Sampath Amarasekara | 47.31 | ||
| 10 | 2 | Shake Mortaja | 47.63 | ||
| 11 | 2 | Hadi Rahimi | 47.82 | ||
| 12 | 1 | Dmitriy Korobeynikov | 47.88 | ||
| 13 | 2 | Heru Astriyanto | 47.89 | SB | |
| 13 | 3 | Karar Al-Abbody | 47.89 | SB | |
| 15 | 1 | Obaid Al Quraini | 48.11 | ||
| 16 | 3 | Yuvaraaj Panerselvam | 48.17 | ||
| 17 | 3 | Hafiy Tajuddin Rositi | 49.81 | PB | |
| 18 | 2 | M. Tsetsegmaa | 51.92 | ||
| 19 | 1 | Haji Muhammad Sukardi | 52.00 | ||
| 20 | 1 | Abdul Qahar Rahmati | 55.78 |
Final
| Rank | Lane | Name | Nationality | Time | Notes |
| 6 | Yousef Ahmed Masrahi | 45.79 | |||
| 4 | Hideyuki Hirose | 46.03 | |||
| 7 | Yuzo Kanemaru | 46.38 | |||
| 4 | 2 | Sajjad Hashemiahangari | 46.53 | ||
| 5 | 3 | Yusuke Ishitsuka | 46.53 | ||
| 6 | 8 | Ismail Al-Sabani | 47.15 | ||
| 9 | Park Bong-Go | ||||
| 5 | Ahmed Al-Marjibi | FS |