Japan at the 2023 World Aquatics Championships

Japan competed at the 2023 World Aquatics Championships in Fukuoka, Japan from 14 to 30 July.

Medalists

 * width=78% align=left valign=top |

Athletes by discipline
The following is the list of number of competitors participating at the Championships per discipline.

Artistic swimming

 * Men


 * Women


 * Mixed

Diving
Japan entered 9 divers.
 * Men


 * Women


 * Mixed

Open water swimming
Japan entered 8 open water swimmers.


 * Men


 * Women


 * Mixed

Swimming
Japan entered 39 swimmers.


 * Men


 * Women
 * Mixed

Water polo

 * Summary

Men's tournament

 * Team roster


 * Group play


 * Playoffs


 * 9–12th place semifinals


 * Eleventh place game

Women's tournament

 * Team roster


 * Group play


 * 13–16th place semifinals


 * 13th place game