NBL1 is a semi-professional basketball league in Australia, consisting of South, North, Central, West and East Conferences with both men's and women's competitions. Each conference is run by their respective state governing body, with the league including 76 clubs from across every state and territory. The league replaced the South East Australian Basketball League (SEABL), Australia's pre-eminent semi-professional basketball league between 1981 and 2018. Following the NBL1's inaugural season in 2019, the 2020 season saw the 2019 teams comprise the new South Conference and the former Queensland Basketball League (QBL) and Premier League (South Australia) become the new North and Central Conferences. The league was joined by the teams from the former WA State Basketball League (SBL) in 2021