Japan at the 2015 World Aquatics Championships

Diving

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

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.

Synchronized swimming

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

Men's tournament

Women's tournament