Japan at the 2013 World Aquatics Championships

Japan competed at the 2013 World Aquatics Championships in Barcelona, Spain between 19 July and 4 August 2013.

Diving
Japan qualified four quota places for the following diving events:


 * Men


 * Women

Open water swimming
Japan qualified three quota places for the following events in open water swimming:

Swimming
Japanese swimmers achieved qualifying standards in the following events (up to a maximum of 2 swimmers in each event at the A-standard entry time, and 1 at the B-standard): Among the official roster featured former Olympic champion Kosuke Kitajima and undisputed superstar Kosuke Hagino.


 * Men


 * Women

Synchronized swimming
Japan qualified 11 quota places for each of the following synchronized swimming events.