| Japan | |
| Association: | Japan Hockey Association |
| Confederation: | AHF (Asia) |
| Coach: | Yoshihiro Anai |
| Assistant: | Manabu Yamashita |
| Manager: | Takayasu Mizawa |
| Captain: | Yamato Kawahara |
| Regional Name: | Junior World Cup |
| Regional Cup Apps: | 4 |
| Regional Cup First: | 1997 |
| Regional Cup Best: | 11th (1997) |
| 2Ndregional Name: | Junior Asia Cup |
| 2Ndregional Cup Apps: | 10 |
| 2Ndregional Cup First: | 1988 |
| 2Ndregional Cup Best: | 3rd (1996, 2024) |
The Japan men's national under-21 field hockey team represents Japan in international under-21 field hockey competitions and is controlled by the Japan Hockey Association, the governing body for field hockey in Japan.
Japan has participated in every edition of the Men's Hockey Junior Asia Cup, where their best finish was a third place in 1996. They have qualified four times for the Men's FIH Hockey Junior World Cup, where their best finish is 11th place in 1997.
| Junior World Cup record | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | Host | Position | Squad | |||||||
| 1979 to 1993 | did not qualify | |||||||||
| 1997 | Milton Keynes, England | 11th | 7 | 2 | 0 | 5 | 17 | 22 | ||
| 2001 to 2005 | did not qualify | |||||||||
| 2009 | Johor Bahru, Malaysia Singapore | 13th | 8 | 3 | 1 | 4 | 14 | 26 | ||
| 2013 |  New Delhi, India | did not qualify | ||||||||
| 2016 | Lucknow, India | 13th | 5 | 2 | 0 | 3 | 5 | 12 | Squad | |
| 2021 to 2023 | did not qualify | |||||||||
| 2025 | India | qualified | ||||||||
| Total | 20 | 7 | 1 | 12 | 36 | 60 | [1] | |||
| Junior Asia Cup record[2] | |||
|---|---|---|---|
| Year | Host | Position | |
| 1988 |  Karachi, Pakistan | 6th | |
| 1992 | Kuala Lumpur, Malaysia | 7th | |
| 1996 | Singapore | 3rd | |
| 2000 | Kuala Lumpur, Malaysia | 4th | |
| 2004 | Karachi, Pakistan | 5th | |
| 2008 | Hyderabad, India | 4th | |
| 2012 | Malacca, Malaysia | 5th | |
| 2015 | Kuantan, Malaysia | 4th | |
| 2021 | Dhaka, Bangladesh | cancelled | |
| 2023 | Salalah, Oman | 5th | |
| 2024 | Muscat, Oman | 3rd | |
| Best result | 3rd | ||
On 30 October 2024, the following 18 players were called up for the 2024 Junior Asia Cup in Muscat, Oman from 26 November to 4 December 2024.[3]
Caps updated as of 26 November 2024, after the match against Chinese Taipei.