In 2025, Japan's first-tier professional basketball league (B1) comprised ** teams. The B1 was the largest professional basketball league in terms of the number of participating teams. Japan's professional basketball circuit is managed by the Japan Basketball Association, which is the governing body of basketball in Japan and responsible, among other things, for the spread of basketball and the organization of its professional sports leagues.
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Japan Basketball Association. (April 9, 2025). Number of teams playing in Japan's professional basketball circuit (B.League) as of March 2025, by league [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved August 01, 2026, from /statistics/1293355/japan-number-professional-basketball-teams-by-league/
Japan Basketball Association. "Number of teams playing in Japan's professional basketball circuit (B.League) as of March 2025, by league." Chart. April 9, 2025. ÌÇÐÄÆƽâ°æ. Accessed August 01, 2026. /statistics/1293355/japan-number-professional-basketball-teams-by-league/
Japan Basketball Association. (2025). Number of teams playing in Japan's professional basketball circuit (B.League) as of March 2025, by league. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: August 01, 2026. /statistics/1293355/japan-number-professional-basketball-teams-by-league/
Japan Basketball Association. "Number of Teams Playing in Japan's Professional Basketball Circuit (B.League) as of March 2025, by League." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 9 Apr 2025, /statistics/1293355/japan-number-professional-basketball-teams-by-league/
Japan Basketball Association, Number of teams playing in Japan's professional basketball circuit (B.League) as of March 2025, by league ÌÇÐÄÆƽâ°æ, /statistics/1293355/japan-number-professional-basketball-teams-by-league/ (last visited August 01, 2026)
Number of teams playing in Japan's professional basketball circuit (B.League) as of March 2025, by league [Graph], Japan Basketball Association, April 9, 2025. [Online]. Available: /statistics/1293355/japan-number-professional-basketball-teams-by-league/
