The 2023–24 B1 League season was the eighth season of the B1 League, the top Japanese professional basketball league, since its establishment in 2015.
[1] The regular season began on 5 October 2023.
[2] The Ryukyu Golden Kings are the defending champions, having won their first B1 League title after defeating the Chiba Jets in the 2023 Finals.
[3] All matches in the playoffs were in a best-of-three series.
Teams in bold advanced to the next round.