The Japan national under-20 football team (Japanese: U-20サッカー日本代表) is a national association football team of Japan and is controlled by the Japan Football Association. The year before the FIFA U-20 World Cup, the national team is renamed the Japan national under-19 football team, and the year before that, the national team is renamed the Japan national under-18 football team.

Jaapani U20 jalgpallinaiskond on Jaapani jalgpalliliidu poolt peetav 20-aastaste ja nooremate jalgpallurite meeskond, mis esindab Jaapanit rahvusvahelistel U20 meistrivõistlustel.