| Event: | Women's 800 metre freestyle |
| Championship: | 2015 World Aquatics Championships |
| Dates: | 7 August (heats) 8 August (final) |
| Competitors: | 43 |
| Nations: | 35 |
| Win Value: | 8:07.39 |
| Gold: | Katie Ledecky |
| Goldnoc: | USA |
| Silver: | Lauren Boyle |
| Silvernoc: | NZL |
| Bronze: | Jazmin Carlin |
| Bronzenoc: | GBR |
| Prev: | 2013 |
| Next: | 2017 |
The Women's 800 metre freestyle competition of the swimming events at the 2015 World Aquatics Championships was held on 7 August with the heats and 8 August with the final.[1]
Prior to the championships, the existing world and championship records were as follows.
During the competition, prior to this 800 metre event, on 4 August 2015, Katie Ledecky set a new championship record in the 1500 metre freestyle final; her 800-meter mark was at 8:13.25.
| Date | Event | Name | Nationality | Time | Record | |||
|---|---|---|---|---|---|---|---|---|
| 4 August | align=left | align=left | 8:13.25† | CR | ||||
| 8 August | Final | align=left | align=left | 8:07.39 | , CR |
Legend: † – en route to final mark
The heats were held at 11:17[2]
| Rank | Heat | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|---|
| 1 | 5 | 4 | 8:19.42 | Q | |||
| 2 | 4 | 5 | 8:22.17 | Q | |||
| 3 | 5 | 6 | 8:23.12 | Q | |||
| 4 | 5 | 5 | 8:23.66 | Q | |||
| 5 | 4 | 4 | 8:23.83 | Q | |||
| 6 | 4 | 6 | 8:24.83 | Q, NR | |||
| 7 | 4 | 2 | 8:26.16 | Q | |||
| 8 | 5 | 3 | 8:26.96 | Q | |||
| 9 | 5 | 2 | 8:28.39 | ||||
| 10 | 4 | 3 | Becca Mann | 8:28.44 | |||
| 11 | 3 | 2 | 8:33.12 | ||||
| 12 | 5 | 8 | 8:33.33 | ||||
| 13 | 4 | 7 | 8:34.89 | ||||
| 14 | 5 | 9 | 8:35.17 | ||||
| 15 | 4 | 1 | 8:36.88 | ||||
| 16 | 5 | 7 | 8:38.56 | ||||
| 17 | 4 | 8 | 8:38.85 | ||||
| 18 | 3 | 7 | 8:39.12 | ||||
| 19 | 5 | 1 | 8:39.55 | ||||
| 20 | 2 | 5 | 8:39.88 | ||||
| 21 | 3 | 3 | 8:41.15 | ||||
| 22 | 4 | 0 | 8:41.72 | ||||
| 23 | 2 | 3 | 8:42.14 | NR | |||
| 24 | 3 | 0 | 8:42.83 | ||||
| 25 | 3 | 4 | 8:43.24 | ||||
| 26 | 3 | 5 | 8:44.38 | ||||
| 27 | 4 | 9 | 8:44.86 | ||||
| 28 | 3 | 9 | 8:45.37 | ||||
| 29 | 3 | 6 | 8:49.96 | ||||
| 30 | 2 | 4 | 8:53.08 | ||||
| 31 | 2 | 6 | 8:55.20 | ||||
| 32 | 3 | 1 | 8:57.66 | ||||
| 33 | 2 | 1 | 9:00.30 | ||||
| 34 | 2 | 2 | 9:01.19 | ||||
| 35 | 2 | 7 | 9:03.71 | ||||
| 36 | 2 | 9 | 9:09.27 | ||||
| 37 | 3 | 8 | 9:11.78 | ||||
| 38 | 2 | 8 | 9:16.23 | ||||
| 39 | 2 | 0 | 9:16.89 | ||||
| 40 | 1 | 4 | 9:18.30 | ||||
| 41 | 1 | 5 | 9:35.53 | ||||
| 42 | 1 | 3 | 9:37.68 | ||||
| 43 | 1 | 6 | 9:48.87 | ||||
| 5 | 0 | DNS |
The final was held on 8 August at 18:55.[3]
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 4 | 8:07.39 | |||||
| 6 | 8:17.65 | OC | ||||
| 2 | 8:18.15 | |||||
| 4 | 5 | 8:18.41 | NR | |||
| 5 | 3 | 8:21.36 | ||||
| 6 | 8 | 8:22.93 | ||||
| 7 | 1 | 8:23.67 | ||||
| 8 | 7 | 8:24.12 | NR |