The men's 800 metres event at the 1985 European Athletics Indoor Championships was held on 2 and 3 March.[1]
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| Rob Harrison | Petru Drăgoescu Romania | Leonid Masunov |
First 2 from each heat (Q) and the next 6 fastest (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 3 | 1:48.68 | Q | |||
| 2 | 2 | 1:48.69 | Q | |||
| 3 | 3 | 1:48.77 | Q | |||
| 4 | 2 | 1:49.00 | Q | |||
| 4 | 3 | 1:49.00 | q | |||
| 6 | 3 | 1:49.09 | q | |||
| 7 | 1 | 1:49.12 | Q | |||
| 8 | 1 | 1:49.20 | Q | |||
| 9 | 2 | 1:49.30 | q | |||
| 10 | 1 | 1:49.36 | q | |||
| 11 | 3 | 1:49.66 | q | |||
| 12 | 2 | 1:49.77 | q | |||
| 13 | 2 | 1:49.99 | ||||
| 14 | 1 | 1:50.44 | ||||
| 15 | 1 | 1:50.48 | ||||
| 16 | 3 | 1:50.50 | ||||
| 17 | 2 | 1:50.71 | ||||
| 18 | 1 | 1:52.62 |
First 3 from each semifinal qualified directly (Q) for the final.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 1 | 1:47.21 | Q, NR | |||
| 2 | 1 | 1:47.52 | Q | |||
| 3 | 1 | 1:47.55 | Q | |||
| 4 | 2 | 1:47.72 | Q, PB | |||
| 5 | 2 | 1:47.84 | Q | |||
| 6 | 2 | 1:48.38 | Q | |||
| 7 | 1 | 1:48.50 | ||||
| 8 | 2 | 1:49.08 | ||||
| 9 | 1 | 1:50.13 | ||||
| 10 | 2 | 1:51.35 | ||||
| 11 | 1 | 1:53.61 | ||||
| 2 |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 1:49.09 | |||||
| 1:49.38 | |||||
| 1:49.59 | |||||
| 4 | 1:49.92 | ||||
| 5 | 1:50.00 | ||||
| 6 | 1:50.05 |