2018 FINA World Swimming Championships (25 m) – Women's 800 metre freestyle
# 2018 FINA World Swimming Championships (25 m) – Women's 800 metre freestyle

The women's 800 metre freestyle competition of the 2018 FINA World Swimming Championships (25 m) was held on 12 and 13 December 2018.

## Records

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

| | Name | Nation | Time | Location | Date |
| - | - | - | - | - | - |
| World record | Mireia Belmonte | Spain | 7:59.34 | Berlin | 10 August 2013 |
| Championship record | Mireia Belmonte | Spain | 8:03.41 | Doha | 4 December 2014 |

## Results

### Heats

The heats were started on 12 December at 11:25.

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - | - |
| 1 | 4 | 4 | Wang Jianjiahe | China | 8:07.59 | Q |
| 2 | 3 | 6 | Leah Smith | United States | 8:12.28 | Q |
| 3 | 3 | 4 | Sarah Köhler | Germany | 8:15.15 | Q |
| 4 | 4 | 2 | Simona Quadarella | Italy | 8:16.68 | Q |
| 5 | 3 | 5 | Li Bingjie | China | 8:16.75 | Q |
| 6 | 3 | 3 | Anna Egorova | Russia | 8:19.45 | Q |
| 7 | 4 | 1 | Hayley Anderson | United States | 8:19.52 | Q |
| 8 | 3 | 2 | Mayuko Goto | Japan | 8:19.93 | Q |
| 9 | 4 | 7 | Yukimi Moriyama | Japan | 8:22.23 | |
| 10 | 3 | 7 | Jimena Pérez | Spain | 8:24.65 | |
| 11 | 3 | 8 | Katja Fain | Slovenia | 8:25.89 | |
| 12 | 2 | 5 | Tamila Holub | Portugal | 8:29.58 | |
| 13 | 4 | 8 | Diana Durães | Portugal | 8:30.12 | |
| 14 | 3 | 1 | Marlene Kahler | Austria | 8:31.49 | |
| 15 | 4 | 0 | Caitlin Deans | New Zealand | 8:35.26 | |
| 16 | 2 | 4 | Beril Böcekler | Turkey | 8:36.33 | |
| 17 | 3 | 0 | Ho Nam Wai | Hong Kong | 8:39.55 | |
| 18 | 3 | 9 | Hayley McIntosh | New Zealand | 8:40.35 | |
| 19 | 4 | 9 | Hanna Eriksson | Sweden | 8:43.36 | |
| 20 | 2 | 2 | Souad Cherouati | Algeria | 8:44.73 | |
| 21 | 2 | 6 | Delfina Dini | Argentina | 8:44.81 | |
| 22 | 2 | 3 | María Bramont-Arias | Peru | 8:49.41 | |
| 23 | 2 | 1 | Chen Szu-an | Chinese Taipei | 8:54.36 | |
| 24 | 2 | 7 | Laura Benková | Slovakia | 8:54.71 | |
| 25 | 2 | 9 | Kristina Miletić | Croatia | 8:55.97 | |
| 26 | 2 | 0 | Rosalee Mira Santa Ana | Philippines | 9:01.90 | NR |
| 27 | 1 | 3 | Therese Soukup | Seychelles | 9:22.68 | |
| 28 | 1 | 4 | Tiana Rabarijaona | Madagascar | 9:44.98 | |
| 29 | 1 | 5 | Sonja Kapedani | Albania | 10:04.17 | |
| | 2 | 8 | Talita Te Flan | Ivory Coast | DNS | |
| | 4 | 3 | Ariarne Titmus | Australia | DNS | |
| | 4 | 5 | Boglárka Kapás | Hungary | DNS | |
| | 4 | 6 | Maddy Gough | Australia | DNS | |

### Final

The final was held on 13 December at 20:37.

| Rank | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - |
| | 4 | Wang Jianjiahe | China | 8:04.35 | |
| | 6 | Simona Quadarella | Italy | 8:08.03 | |
| | 5 | Leah Smith | United States | 8:08.75 | |
| 4 | 2 | Li Bingjie | China | 8:09.81 | |
| 5 | 3 | Sarah Köhler | Germany | 8:10.54 | NR |
| 6 | 7 | Anna Egorova | Russia | 8:12.65 | |
| 7 | 1 | Hayley Anderson | United States | 8:18.70 | |
| 8 | 8 | Mayuko Goto | Japan | 8:22.10 | |
