The women's 800 metres event at the 2016 IAAF World U20 Championships was held at Zdzisław Krzyszkowiak Stadium on 19, 20 and 21 July.
| Gold | Samantha Watson | |
| Silver | Aaliyah Miller | |
| Bronze | Tigist Ketema |
| Standing records prior to the 2016 IAAF World U20 Championships in Athletics | |||||
|---|---|---|---|---|---|
| World Junior Record | 1:54.01 | Zürich, Switzerland | 29 August 2008 | ||
| Championship Record | 2:00.06 | Bydgoszcz, Poland | 11 July 2008 | ||
| World Junior Leading | 1:59.14 | Doha, Qatar | 6 May 2016 | ||
Qualification: First 4 of each heat (Q) and the 4 fastest times (q) qualified for the semifinals.[1]
| Rank | Heat | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|
| 1 | 2 | 2:05.51 | Q | |||
| 2 | 2 | 2:05.69 | Q | |||
| 3 | 2 | 2:06.13 | Q | |||
| 4 | 1 | 2:06.21 | Q | |||
| 5 | 1 | 2:06.25 | Q | |||
| 6 | 2 | 2:06.59 | Q, PB | |||
| 7 | 2 | 2:06.91 | q, PB | |||
| 8 | 4 | 2:07.30 | Q | |||
| 9 | 4 | 2:07.70 | Q | |||
| 10 | 4 | 2:07.95 | Q | |||
| 11 | 3 | 2:08.13 | Q | |||
| 12 | 1 | 2:08.16 | Q | |||
| 13 | 1 | 2:08.21 | Q | |||
| 14 | 2 | 2:08.31 | q | |||
| 15 | 1 | 2:08.41 | q | |||
| 16 | 3 | 2:08.44 | Q | |||
| 17 | 3 | 2:08.48 | Q | |||
| 18 | 3 | 2:08.63 | Q | |||
| 19 | 1 | 2:08.94 | q | |||
| 20 | 3 | 2:09.28 | ||||
| 21 | 4 | 2:09.43 | Q | |||
| 22 | 4 | 2:09.51 | ||||
| 23 | 3 | 2:09.53 | ||||
| 24 | 2 | 2:09.64 | ||||
| 25 | 3 | 2:09.67 | ||||
| 26 | 5 | 2:10.96 | Q | |||
| 27 | 5 | 2:11.00 | Q | |||
| 28 | 5 | 2:11.18 | Q | |||
| 29 | 1 | 2:11.42 | ||||
| 30 | 5 | 2:11.72 | Q | |||
| 31 | 5 | 2:11.98 | ||||
| 32 | 4 | 2:12.30 | ||||
| 33 | 5 | 2:13.05 | ||||
| 34 | 5 | 2:13.45 | ||||
| 4 | R163.3(a)[2] | |||||
| 3 |
Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.[3]
| Rank | Heat | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|
| 1 | 1 | 2:04.36 | Q | |||
| 2 | 3 | 2:04.50 | Q | |||
| 3 | 3 | 2:04.55 | Q | |||
| 4 | 2 | 2:05.09 | Q | |||
| 5 | 1 | 2:05.13 | Q | |||
| 6 | 1 | 2:05.32 | q | |||
| 7 | 2 | 2:05.45 | Q | |||
| 8 | 3 | 2:05.46 | q | |||
| 9 | 2 | 2:05.47 | PB | |||
| 10 | 2 | 2:05.47 | ||||
| 11 | 1 | 2:06.24 | PB | |||
| 12 | 2 | 2:06.32 | PB | |||
| 13 | 3 | 2:06.84 | ||||
| 14 | 2 | 2:06.86 | ||||
| 15 | 3 | 2:07.18 | ||||
| 16 | 3 | 2:07.78 | ||||
| 17 | 3 | 2:07.91 | PB | |||
| 18 | 3 | 2:08.09 | ||||
| 19 | 1 | 2:08.11 | ||||
| 20 | 1 | 2:08.43 | SB | |||
| 21 | 1 | 2:08.44 | ||||
| 22 | 2 | 2:09.80 | ||||
| 23 | 2 | 2:09.98 | ||||
| 24 | 1 | 2:11.44 |
| Rank | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|
| 2:04.52 | |||||
| 2:05.06 | |||||
| 2:05.13 | |||||
| 4 | 2:05.82 | ||||
| 5 | 2:06.04 | ||||
| 6 | 2:06.11 | ||||
| 7 | 2:06.27 | ||||
| 8 | 2:06.32 |