Japan at the 2015 World Aquatics Championships

Japan competed at the 2015 World Aquatics Championships in Kazan, Russia from 24 July to 9 August 2015.

Diving
Japanese divers qualified for the individual spots and the synchronized teams at the World Championships.


 * Men


 * Women


 * Mixed

Open water swimming
Japan has fielded a team of four swimmers to compete in the open water marathon. Among the official roster are 2012 Olympians Yasunari Hirai and Yumi Kida.

Swimming
Japanese swimmers have 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): Swimmers must qualify at the 2015 Japanese Championships (for pool events) to confirm their places at the Worlds.

Twenty-four swimmers have been officially nominated to the Japanese team to compete in the Worlds, including defending champion Daiya Seto in the 400 m individual medley and Olympic medalists Ryosuke Irie, Ryo Tateishi, and Natsumi Hoshi. Japan's rising superstar Kosuke Hagino was set to compete, but later withdrew from the team due to elbow fracture.


 * Men


 * Women


 * Mixed

Synchronized swimming
Japan fielded a full squad of twelve synchronized swimmers (one male and eleven female) to compete in each of the following events.


 * Women


 * Mixed

Men's tournament

 * Team roster


 * Katsuyuki Tanamura
 * Seiya Adachi
 * Atsushi Arai
 * Mitsuaki Shiga
 * Akira Yanase
 * Atsuto Iida
 * Yusuke Shimizu
 * Yuki Kadono
 * Koji Takei
 * Kenya Yasuda
 * Keigo Okawa
 * Shota Hazui
 * Tomoyoshi Fukushima


 * Group play


 * 13th–16th place semifinals


 * 13th place game

Women's tournament

 * Team roster


 * Rikako Miura
 * Chiaki Sakanoue
 * Yuri Kazama
 * Shino Magariyama
 * Moe Nakata
 * Ayaka Takahashi
 * Yumi Nakano
 * Mitsuki Hashiguchi
 * Kana Hosoya
 * Tsubasa Mori
 * Marina Tokumoto
 * Kotori Suzuki
 * Yuko Umeda


 * Group play


 * 13th–16th place semifinals


 * 15th place game