| Japan | |
| Badge: | Japan national ice hockey team 2015.png |
| Badge Size: | 140px |
| Association: | Japan Ice Hockey Federation |
| Coach: |  Perry Pearn |
| Asst Coach: |  Teruhiko Okita Terashima Hiroshi |
| Captain: | Yuto Osawa |
| Most Games: | Hiroshi Sato (17) |
| Most Points: | Makuru Furuhashi (29) |
| Iihf Code: | JPN |
| First Game: | 4 - 2 (Heerenveen, Netherlands; March 16, 1982) |
| Largest Win: | 17 - 1 (Canazei, Italy; December 13, 2007) |
| Largest Loss: | 20 - 1 (Gävle, Sweden; December 30, 1992) |
| World Champ2 Name: | IIHF World U20 Championship |
| World Champ2 Apps: | 30 |
| World Champ2 First: | 1982 |
| World Champ2 Best: | 8th (1993) |
| Record: | 89-81-13 |
The Japanese men's national under-20 ice hockey team (Japanese: アイスホッケー男子U-20日本代表 Aisuhokkē Danshi U-20 Nippon Daihyō) represents Japan at the International Ice Hockey Federation's World Junior Hockey Championship Division I.