Swimming at the 2023 World Aquatics Championships – Women's 800 metre freestyle

The women's 800 metre freestyle competition at the 2023 World Aquatics Championships was held on 28 and 29 July 2023.

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

Heats
The heats were started on 28 July at 12:13.

Final
The final was held on 29 July at 21:23.