The men's 400 metres event at the 2013 Asian Athletics Championships was held at the Shree Shiv Chhatrapati Sports Complex. The final took place on 4 July.
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| Yousef Masrahi | Ali Khamis Khamis | Yuzo Kanemaru |
First 3 in each heat (Q) and 4 best performers (q) advanced to the semifinals.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 1 | 46.43 | Q | |||
| 2 | 3 | 46.46 | Q | |||
| 3 | 1 | 46.59 | Q | |||
| 4 | 3 | 46.67 | Q | |||
| 5 | 3 | 46.96 | Q | |||
| 6 | 2 | 46.99 | Q | |||
| 7 | 1 | 47.02 | Q | |||
| 8 | 2 | 47.04 | Q | |||
| 9 | 1 | 47.10 | q | |||
| 10 | 3 | 47.24 | q | |||
| 11 | 2 | 47.40 | Q | |||
| 12 | 2 | 47.43 | q | |||
| 13 | 4 | 47.67 | Q | |||
| 14 | 1 | 47.87 | q | |||
| 15 | 4 | 48.04 | Q | |||
| 16 | 3 | 48.23 | ||||
| 17 | 4 | 48.27 | Q | |||
| 18 | 4 | 48.51 | ||||
| 19 | 4 | 48.85 | ||||
| 20 | 1 | 48.87 | ||||
| 21 | 2 | 48.90 | ||||
| 22 | 1 | 48.96 | ||||
| 23 | 4 | 49.09 | ||||
| 24 | 2 | 49.17 | ||||
| 25 | 3 | 49.42 | ||||
| 26 | 4 | 49.49 | ||||
| 27 | 2 | 52.48 | ||||
| 28 | 3 | 53.90 | ||||
| 29 | 2 | 54.90 | ||||
| 30 | 3 | 58.64 | ||||
| 1 |
First 3 in each heat (Q) and 2 best performers (q) advanced to the final.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 1 | 46.35 | Q | |||
| 2 | 2 | 46.42 | Q | |||
| 3 | 1 | 46.44 | Q | |||
| 4 | 2 | 46.49 | Q | |||
| 5 | 2 | 46.83 | Q | |||
| 6 | 2 | 47.03 | q | |||
| 7 | 1 | 47.05 | Q | |||
| 8 | 1 | 47.06 | q | |||
| 9 | 1 | 47.14 | ||||
| 10 | 1 | 47.39 | ||||
| 11 | 2 | 47.70 | ||||
| 12 | 1 | 47.80 | ||||
| 13 | 1 | 47.93 | ||||
| 14 | 2 | 48.18 | ||||
| 2 | ||||||
| 2 |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 45.08 | |||||
| 45.65 | |||||
| 45.95 | |||||
| 4 | 46.45 | ||||
| 5 | 46.61 | ||||
| 6 | 46.63 | ||||
| 7 | 47.15 | ||||