The Japan national under-20 rugby union team is Japan's junior national team in rugby union.

Japan won the IRB Junior World Rugby Trophy in 2014, beating Tonga in the final 35–10.

This qualified them for the 2015 IRB Junior World Championship in Italy.

This is the squad for the 2014 IRB Junior World Rugby Trophy.

[2] Forwards Backs The following Japan U20s players have been recognised at the World Rugby Awards since 2008:[3]