Swimming at the 2013 World Aquatics Championships – Women's 800 metre freestyle

The women's 800 metre freestyle event in swimming at the 2013 World Aquatics Championships took place on 2–3 August at the Palau Sant Jordi in Barcelona, Spain.

Records
Prior to this competition, the existing world and championship records were:

The following new records were set during this competition.

Heats
The heats were held at 2 August.

Final
The final was held at 19:26.