The 2021 NBL1 West season was the inaugural season of the NBL1 West. After 32 years known as the State Basketball League (SBL), the league was rebranded under the NBL1 banner for 2021. The regular season began on Friday 16 April and ended on Saturday 14 August. The finals began on Friday 20 August and concluded with the women's grand final on Friday 3 September and the men's grand final on Saturday 4 September.