The Men's 400 metres event at the 2007 European Athletics Indoor Championships was held on 2–3 March.
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| David Gillick | Bastian Swillims | Robert Tobin |
First 2 of each heat (Q) and the next 4 fastest (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | 46.08 | Q | |||
| 2 | 2 | 46.70 | Q | |||
| 3 | 1 | 46.77 | Q | |||
| 4 | 4 | 46.85 | Q | |||
| 5 | 2 | 46.87 | Q | |||
| 6 | 3 | 46.92 | Q | |||
| 7 | 2 | 47.05 | q, PB | |||
| 8 | 3 | 47.07 | Q | |||
| 9 | 3 | 47.08 | q, PB | |||
| 10 | 3 | 47.12 | q | |||
| 11 | 4 | 47.41 | q | |||
| 12 | 1 | 47.45 | Q | |||
| 13 | 2 | 47.51 | ||||
| 14 | 1 | 47.58 | ||||
| 15 | 1 | 47.61 | ||||
| 16 | 4 | 47.65 | ||||
| 17 | 1 | 47.73 | PB | |||
| 18 | 2 | 47.76 | SB | |||
| 19 | 3 | 48.48 | SB | |||
| 20 | 3 | 49.15 | ||||
| 21 | 1 | 49.97 | PB | |||
| 21 | 4 | 50.18 | NR | |||
| 4 |
First 3 of each semifinals qualified directly (Q) for the final.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 1 | 45.92 | Q | |||
| 2 | 2 | 46.16 | Q | |||
| 3 | 2 | 46.19 | Q | |||
| 4 | 1 | 46.25 | Q | |||
| 5 | 1 | 46.47 | Q, PB | |||
| 6 | 2 | 47.01 | Q | |||
| 7 | 2 | 47.14 | ||||
| 8 | 1 | 47.32 | ||||
| 9 | 1 | 47.47 | ||||
| 10 | 2 | 47.60 | ||||
| 11 | 2 | 47.81 | ||||
| 12 | 1 | 48.23 |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 45.52 | NR | ||||
| 45.62 | PB | ||||
| 46.15 | |||||
| 4 | 46.17 | SB | |||
| 5 | 46.47 | =PB | |||
| 6 | 46.64 |