B.League
| Organising body | Japan Professional Basketball League |
|---|---|
| Founded | April 1, 2015 |
| First season | 2016–17 |
| Country | Japan |
| Federation | Japan Basketball Association |
| Confederation | FIBA Asia |
| Divisions | B1 League B2 League B3 League |
| Number of teams | 55 (B1: 24, B2: 14, B3: 17) |
| Level on pyramid | 1–3 |
| Feeder to | Basketball Champions League Asia East Asia Super League |
| Current champions | B1: Utsunomiya Brex (3rd title) B2: Altiri Chiba and Toyama Grouses (1st title) (2024–25) |
| Most championships | B1: Utsunomiya Brex (3 titles) B2: Nishinomiya Storks Rizing Zephyr Fukuoka Shinshu Brave Warriors Gunma Crane Thunders Fighting Eagles Nagoya Saga Ballooners Shiga Lakes Altiri Chiba Toyama Grouses (1 title each) |
| President | Shinji Shimada |
| TV partners | NHK |
| Website | www.bleague.jp |
| 2024–25 B1 League season | |
The B.League is a men's professional basketball league in Japan. The league is operated by the Japan Professional Basketball League and was formed as a result of a merger between the National Basketball League that was operated by the FIBA-affiliated Japan Basketball Association and the independently operated bj league. The merger had been mandated by FIBA as a condition to Japan having its membership resumed following suspension in November 2014. The league began play in September 2016.