The Japanese basketball league system, or Japanese basketball league pyramid is a series of interconnected competitions for professional basketball clubs in the country of Japan. The system has a hierarchical format with a promotion and demotion system between competitions at different levels.
| Level | League(s)/Division(s) |
|---|---|
| I | B1 League 18 clubs ↓ 2 relegation spots + 1 relegation playoff spot |
| II | B2 League 18 clubs ↑ 2 promotion spots + 8 promotion playoffs spots ↓ 1 relegation spots |
| III | B3 League 12 clubs ↑ 1 promotion spots no relegation |
| IV | Japan Society Basketball Federation[1] |
| V | Japan College Basketball Federation[2] |
| VI | Japan Mini Basketball Federation |
| Level | League(s)/Division(s) |
|---|---|
| I | Women's Japan Basketball League 12 clubs no relegation |
| II | Japan Society Basketball Federation |
| III | Japan College Basketball Federation |
| IV | Japan Mini Basketball Federation |