The women's 800 metres event at the 2015 European Athletics U23 Championships was held in Tallinn, Estonia, at Kadriorg Stadium on 9 and 11 July.
| Gold | Rénelle Lamote | |
| Silver | Anastasiya Tkachuk | |
| Bronze | Christina Hering |
11 July
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | | 2:00.19 | ||||
| align=left | align=left | | 2:00.43 | ||||
| align=left | align=left | 2:00.88 | PB | ||||
| 4 | align=left | align=left | 2:01.66 | ||||
| 5 | align=left | align=left |  | 2:02.53 | PB | ||
| 6 | align=left | align=left | 2:03.45 | ||||
| 7 | align=left | align=left |  | 2:03.92 | PB | ||
| 8 | align=left | align=left |  | 2:04.42 |
9 July
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 2:02.03 | Q | ||
| 2 | align=left | align=left | 2:03.16 | Q | |||
| 3 | align=left | align=left | | 2:03.47 | q | ||
| 4 | align=left | align=left |  | 2:05.27 | |||
| 5 | align=left | align=left |  | 2:05.30 | |||
| 6 | align=left | align=left |  | 2:19.21 |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 2:04.84 | Q | ||
| 2 | align=left | align=left | 2:04.85 | Q | |||
| 3 | align=left | align=left | | 2:04.88 | |||
| 4 | align=left | align=left |  | 2:06.69 | |||
| 5 | align=left | align=left | | 2:07.59 | |||
| 6 | align=left | align=left | 2:07.74 |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 2:02.75 | Q | ||
| 2 | align=left | align=left | | 2:03.45 | Q | ||
| 3 | align=left | align=left | 2:04.67 | q | |||
| 4 | align=left | align=left |  | 2:06.08 | |||
| 5 | align=left | align=left | | 2:06.55 |
According to an unofficial count, 17 athletes from 13 countries participated in the event.