Swimming at the 2009 World Aquatics Championships – Women's 800 metre freestyle

The heats for the Women's 800 m Freestyle race at the 2009 World Championships took place on the morning of 31 July and the final will take place in the evening session of 1 August at the Foro Italico in Rome, Italy.

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

The following records were established during the competition: