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.

[1][2] Prior to this competition, the existing world and championship records were: The following new records were set during this competition.

The heats were held at 2 August.

[6] The final was held at 19:26.

[7]