| Event: | Women's 800m Freestyle |
| Competition: | 2012 Short Course Worlds |
| Dates: | 13 December |
| Win Value: | 8:08.62 |
| Gold: | Lauren Boyle |
| Goldnoc: | NZL |
| Silver: | Lotte Friis |
| Silvernoc: | DEN |
| Bronze: | Chloe Sutton |
| Bronzenoc: | USA |
| Prev: | 2010 |
| Next: | 2014 |
See main article: article and 2012 FINA World Swimming Championships (25 m).
The women's 800 metre freestyle event at the 11th FINA World Swimming Championships (25m) took place 13 December 2012 at the Sinan Erdem Dome. This event was a timed-final where each swimmer swam just once. The top 8 seeded swimmers swam in the evening, and the remaining swimmers swam in the morning session.
Prior to this competition, the existing world and championship records were as follows.
| Name | Nation | Time | Location | Date | |||
|---|---|---|---|---|---|---|---|
| World record | Camille Muffat | align=left | 8:01.06 | 16 November 2012 | |||
| Championship record | align=left | 8:08.25 | 10 April 2008 |
No new records were set during this competition.
| Rank | Heat | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|---|
| 4 | 7 |  | 8:08.62 | OC | |||
| 4 | 4 | 8:10.99 | |||||
| 4 | 3 |  | 8:15.53 | ||||
| 4 | 4 | 2 |  | 8:16.09 | |||
| 5 | 4 | 5 |  | 8:16.90 | |||
| 6 | 4 | 1 | | 8:19.27 | |||
| 7 | 1 | 5 |  | 8:22.88 | |||
| 8 | 4 | 8 | | 8:22.96 | |||
| 9 | 4 | 6 | | 8:23.56 | |||
| 10 | 1 | 4 | | 8:25.19 | |||
| 11 | 3 | 5 |  | 8:28.09 | |||
| 12 | 3 | 1 |  | 8:28.31 | NR | ||
| 13 | 3 | 2 | | 8:28.60 | |||
| 14 | 3 | 6 |  | 8:29.77 | |||
| 15 | 3 | 0 |  | 8:30.42 | |||
| 16 | 3 | 3 | 8:31.14 | ||||
| 17 | 3 | 8 | 8:35.62 | ||||
| 18 | 3 | 7 |  | 8:42.35 | |||
| 19 | 3 | 4 | 8:49.07 | ||||
| 20 | 2 | 8 | 8:57.56 | NR | |||
| 21 | 2 | 3 | 8:59.19 | ||||
| 22 | 3 | 9 | 8:59.74 | ||||
| 23 | 2 | 5 |  | 9:01.06 | |||
| 24 | 2 | 7 | 9:09.66 | ||||
| 25 | 2 | 1 | 9:14.38 | ||||
| 26 | 2 | 6 |  | 9:14.46 | |||
| 27 | 2 | 2 | | 9:21.55 | |||
| 28 | 2 | 4 | 9:22.55 | ||||
| 29 | 1 | 3 | 9:23.63 |