Swimming at the 2011 World Aquatics Championships – Women's 800 metre freestyle

The women's 800 metre freestyle competition of the swimming events at the 2011 World Aquatics Championships was held on July 29 with the heats and July 30 with the final.

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

Heats
32 swimmers participated in 5 heats.

Final
The final was held at 19:30.