Swimming at the 2017 World Aquatics Championships – Women's 800 metre freestyle
# Swimming at the 2017 World Aquatics Championships – Women's 800 metre freestyle

The Women's 800 metre freestyle competition at the 2017 World Championships was held on 28 and 29 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.

| World record | Katie Ledecky (USA) | 8:04.79 | Rio de Janeiro, Brazil | 12 August 2016 |
| - | - | - | - | - |
| Competition record | Katie Ledecky (USA) | 8:07.39 | Kazan, Russia | 8 August 2015 |

## Results

### Heats

The heats were held on 28 July at 11:06.

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - | - |
| 1 | 4 | 4 | Katie Ledecky | United States | 8:20.24 | Q |
| 2 | 3 | 5 | Leah Smith | United States | 8:21.19 | Q |
| 3 | 4 | 3 | Li Bingjie | China | 8:22.92 | Q |
| 4 | 4 | 5 | Mireia Belmonte | Spain | 8:24.98 | Q |
| 5 | 3 | 6 | Simona Quadarella | Italy | 8:27.70 | Q |
| 6 | 3 | 4 | Boglárka Kapás | Hungary | 8:28.93 | Q |
| 7 | 4 | 6 | Zhang Yuhan | China | 8:29.52 | Q |
| 8 | 3 | 1 | Holly Hibbott | Great Britain | 8:30.66 | Q |
| 9 | 3 | 2 | Ajna Késely | Hungary | 8:32.01 | |
| 10 | 2 | 4 | Julia Hassler | Liechtenstein | 8:34.13 | NR |
| 11 | 4 | 8 | Celine Rieder | Germany | 8:34.16 | |
| 12 | 3 | 8 | Kristel Köbrich | Chile | 8:34.51 | |
| 13 | 3 | 9 | Diana Duraes | Portugal | 8:35.10 | |
| 14 | 3 | 3 | Ariarne Titmus | Australia | 8:37.10 | |
| 15 | 4 | 2 | Tjaša Oder | Slovenia | 8:38.84 | |
| 16 | 4 | 1 | Mackenzie Padington | Canada | 8:40.68 | |
| 17 | 2 | 3 | Choi Jung-min | South Korea | 8:40.87 | |
| 18 | 4 | 7 | Jimena Pérez | Spain | 8:41.41 | |
| 19 | 4 | 9 | Gaja Natlačen | Slovenia | 8:41.49 | |
| 20 | 4 | 0 | Olivia Anderson | Canada | 8:43.93 | |
| 21 | 3 | 0 | Tamila Holub | Portugal | 8:44.85 | |
| 22 | 3 | 7 | Emma Robinson | New Zealand | 8:44.87 | |
| 23 | 2 | 5 | Paulina Piechota | Poland | 8:49.76 | |
| 24 | 2 | 7 | Martina Elhenická | Czech Republic | 8:52.39 | |
| 25 | 2 | 1 | Monique Olivier | Luxembourg | 8:54.27 | |
| 26 | 2 | 8 | Hania Moro | Egypt | 8:54.30 | |
| 27 | 1 | 4 | María Bramont-Arias | Peru | 8:56.12 | |
| 28 | 2 | 2 | Helena Moreno | Costa Rica | 8:56.43 | |
| 29 | 2 | 9 | Kate Beavon | South Africa | 8:58.31 | |
| 30 | 2 | 0 | Raina Ramdhani | Indonesia | 9:02.49 | |
| 31 | 1 | 5 | Ho Nam Wai | Hong Kong | 9:03.38 | |
| 32 | 1 | 3 | Souad Cherouati | Algeria | 9:05.67 | |
| 33 | 1 | 7 | Talita Te Flan | Ivory Coast | 9:07.56 | |
| 34 | 2 | 6 | Ayumi Macías | Mexico | 9:08.78 | |
| 35 | 1 | 6 | Daniella van den Berg | Aruba | 9:17.77 | |
| 36 | 1 | 1 | Gabriella Doueihy | Lebanon | 9:19.43 | |
| 37 | 1 | 2 | Sudthirak Watcharabusaracum | Thailand | 9:32.44 | |
| 38 | 1 | 8 | Hannah Gill | Barbados | 9:39.78 | |

### Final

The final was held on 29 July at 18:55.

| Rank | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - |
| | 4 | Katie Ledecky | United States | 8:12.68 | |
| | 3 | Li Bingjie | China | 8:15.46 | AS |
| | 5 | Leah Smith | United States | 8:17.22 | |
| 4 | 6 | Mireia Belmonte | Spain | 8:23.30 | |
| 5 | 7 | Boglárka Kapás | Hungary | 8:24.41 | |
| 6 | 1 | Zhang Yuhan | China | 8:26.06 | |
| 7 | 2 | Simona Quadarella | Italy | 8:26.50 | |
| 8 | 8 | Holly Hibbott | Great Britain | 8:38.63 | |
