Japan at the 2017 World Aquatics Championships

Japan competed at the 2017 World Aquatics Championships in Budapest, Hungary from 14 July to 30 July.

Diving
Japan has entered 5 divers (two male and three female).


 * Men


 * Women


 * Mixed

Open water swimming
Japan has entered six open water swimmers

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):


 * Men


 * Women


 * Mixed

Synchronized swimming
Japan's synchronized swimming team consisted of 14 athletes (1 male and 13 female).


 * Women


 * Mixed

Legend: (R) = Reserve Athlete

Water polo
Japan qualified both a men's and women's teams.

Men's tournament

 * Team roster


 * Katsuyuki Tanamura
 * Seiya Adachi
 * Shuma Kawamoto
 * Mitsuaki Shiga
 * Takuma Yoshida
 * Atsuto Iida
 * Yusuke Shimizu (C)
 * Mitsuru Takata
 * Atsushi Arai
 * Kohei Inaba
 * Keigo Okawa
 * Kenya Araki
 * Tomoyoshi Fukushima


 * Group play


 * Playoffs


 * 9th–12th place semifinals


 * Ninth place game

Women's tournament

 * Team roster


 * Miyuu Aoki
 * Yumi Arima
 * Yuri Kazama
 * Shino Magariyama
 * Chiaki Sakanoue
 * Minori Yamamoto
 * Akari Inaba
 * Yuki Niizawa
 * Kana Hosoya
 * Misaki Noro
 * Marina Tokumoto
 * Kotori Suzuki (C)
 * Minami Shioya


 * Group play


 * 13th–16th place semifinals


 * 13th place game