The women's 800 metres at the 2012 World Junior Championships in Athletics will be held at the Estadi Olímpic Lluís Companys on 10, 11, and 12 July.[1]
| Gold | Ajeé Wilson | |
| Silver | Jessica Judd | |
| Bronze | Manal El Bahraoui Morocco |
, the existing world junior and championship records were as follows.
| World Junior Record | 1:54.01 | Zürich, Switzerland | 29 August 2008 | ||
| Championship Record | 2:00.06 | Bydgoszcz, Poland | 11 July 2008 | ||
| World Junior Leading | 2:00.78 | Yalta, Ukraine | 28 May 2012 |
Qualification: The first 3 of each heat (Q) and the 6 fastest times (q) qualified
| Rank | Heat | Lane | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 4 | 2:02.71 | Q | |||
| 2 | 1 | 7 | 2:03.00 | Q, PB | |||
| 3 | 1 | 5 | 2:03.22 | Q, PB | |||
| 4 | 1 | 9 | 2:03.36 | q, PB | |||
| 5 | 5 | 5 | 2:04.19 | Q | |||
| 6 | 5 | 6 | 2:04.74 | Q, New Jersey | |||
| 7 | 1 | 6 | 2:05.63 | q, PB | |||
| 8 | 3 | 4 | 2:05.73 | Q | |||
| 9 | 5 | 3 | 2:05.87 | Q | |||
| 10 | 3 | 3 | 2:05.91 | Q | |||
| 11 | 6 | 5 | 2:06.07 | Q | |||
| 12 | 3 | 8 | 2:06.18 | Q | |||
| 13 | 5 | 7 | 2:06.25 | q | |||
| 14 | 2 | 7 | 2:06.38 | Q | |||
| 15 | 2 | 4 | 2:06.64 | Q | |||
| 16 | 3 | 2 | 2:06.75 | q, PB | |||
| 17 | 3 | 7 | 2:06.89 | q | |||
| 18 | 4 | 5 | 2:07.04 | Q | |||
| 18 | 4 | 9 | 2:07.04 | Q | |||
| 20 | 1 | 3 | 2:07.07 | q | |||
| 21 | 2 | 8 | 2:07.08 | Q | |||
| 22 | 4 | 4 | 2:07.11 | Q | |||
| 23 | 3 | 6 | 2:07.18 | ||||
| 24 | 4 | 6 | 2:07.25 | ||||
| 25 | 2 | 9 | 2:07.32 | ||||
| 26 | 4 | 7 | 2:07.52 | ||||
| 27 | 2 | 6 | 2:07.59 | ||||
| 28 | 6 | 4 | 2:07.78 | Q | |||
| 29 | 6 | 2 | 2:07.84 | Q | |||
| 30 | 2 | 3 | 2:08.03 | ||||
| 31 | 6 | 7 | 2:08.68 | ||||
| 32 | 1 | 8 | 2:09.05 | ||||
| 33 | 4 | 3 | 2:09.51 | ||||
| 34 | 5 | 8 | 2:09.61 | ||||
| 35 | 6 | 3 | 2:10.22 | ||||
| 36 | 3 | 5 | 2:11.97 | ||||
| 37 | 5 | 9 | 2:12.15 | ||||
| 38 | 6 | 6 | 2:12.47 | ||||
| 39 | 5 | 4 | 2:16.82 | ||||
| 40 | 2 | 5 | 2:20.02 | ||||
| 41 | 6 | 8 | 2:29.85 | ||||
| 42 | 3 | 9 | 2:35.97 | ||||
| 4 | 8 | ||||||
| 6 | 9 |
Qualification: The first 2 of each heat (Q) and the 2 fastest times (q) qualified
| Rank | Heat | Lane | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|---|
| 1 | 3 | 4 | 2:02.30 | Q | |||
| 2 | 2 | 5 | 2:02.32 | Q, PB | |||
| 3 | 3 | 7 | 2:02.38 | Q, PB | |||
| 4 | 2 | 7 | 2:02.43 | Q, PB | |||
| 5 | 1 | 5 | 2:02.50 | Q | |||
| 6 | 2 | 6 | 2:02.82 | q, PB | |||
| 7 | 1 | 6 | 2:03.15 | Q, NR | |||
| 8 | 1 | 7 | 2:03.18 | q | |||
| 9 | 3 | 5 | 2:03.98 | ||||
| 10 | 3 | 6 | 2:04.17 | PB | |||
| 11 | 3 | 2 | 2:04.19 | PB | |||
| 12 | 3 | 4 | 2:04.58 | PB | |||
| 13 | 2 | 4 | 2:05.29 | ||||
| 14 | 2 | 3 | 2:05.40 | PB | |||
| 15 | 1 | 2 | 2:05.45 | PB | |||
| 16 | 2 | 8 | 2:05.83 | ||||
| 17 | 1 | 9 | 2:06.70 | ||||
| 18 | 2 | 2 | 2:07.03 | ||||
| 19 | 1 | 3 | 2:07.23 | ||||
| 20 | 1 | 8 | 2:07.91 | ||||
| 21 | 3 | 3 | 2:08.04 | ||||
| 22 | 3 | 4 | 2:09.63 | ||||
| - | 2 | 9 | DQ | ||||
| - | 1 | 4 | DNS |
| Rank | Lane | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|
| 9 | 2:00.91 | PB | ||||
| 6 | 2:00.96 | PB | ||||
| 3 | 2:03.09 | |||||
| 4 | 2 | 2:03.23 | ||||
| 5 | 8 | 2:04.07 | ||||
| 6 | 7 | 2:04.68 | ||||
| 7 | 4 | 2:04.92 | ||||
| 8 | 5 | 2:07.23 |
According to an unofficial count, 42 athletes from 30 countries participated in the event.