The Japan men's national under-21 volleyball team represents Japan in men's under-21 volleyball events, it is controlled and managed by the Japanese Volleyball Association that is a member of Asian volleyball body Asian Volleyball Confederation (AVC) and the international volleyball body government the Fédération Internationale de Volleyball (FIVB).

Champions    Runners up    Third place    Fourth place Champions    Runners up    Third place    Fourth place The following is the Japanese roster in the 2017 FIVB Volleyball Men's U21 World Championship.

[2] Head coach: Tokunaga Fumitoshi