The men's 400 metres event at the 1989 European Athletics Indoor Championships was held on 18 and 19 February.[1]
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| Cayetano Cornet | Brian Whittle | Klaus Just |
First 2 from each heat (Q) and the next 2 fastest (q) qualified for the final.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 1 | 46.70 | Q | |||
| 2 | 2 | 46.75 | Q | |||
| 3 | 1 | 46.79 | Q | |||
| 4 | 1 | 47.16 | q | |||
| 5 | 2 | 47.25 | Q | |||
| 6 | 1 | 47.36 | q | |||
| 7 | 1 | 47.41 | ||||
| 8 | 2 | 47.53 | ||||
| 9 | 2 | 48.21 | ||||
| 2 |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 46.21 | |||||
| 46.49 | |||||
| 46.80 | |||||
| 4 | 47.16 | ||||
| 5 | 47.45 | ||||
| 6 | 47.83 |