The Women's Japan Basketball League (Japanese: 一般社団法人バスケットボール女子日本リーグ) is the premier women's basketball league in Japan. There are currently 14 teams playing in the league, with all of the teams being from cities in the main Japanese island of Honshu. However, from the 2024-25 season, there will be a change to a two level league structure, with the “W-League Premier” being the top league, and the “W-League Future” being the lower league. The W-League premier teams will be Fujitsu Red Wave, Denso Iris, ENEOS Sunflowers, Toyota Antelopes, Chanson V-Magic, Toyota Boshoku Sunshine Rabbits, Hitachi High-Tech Cougars, and Aisin Wings. W-League Future teams will be Mitsubishi Electric Koalas, Tokyo Haneda Vickies, Yamanashi Queenbees, Niigata Algiers BB Rabbits, Prestige International Aranmare Akita, and Himeji Egrets.
The league was founded in 1998, with the Chanson V-Magic winning the inaugural title.