The National Basketball League (NBL) is the first-tier basketball league in Singapore. It was established in 2011 and founded by the Basketball Association of Singapore (BAS). Matches are played at the Singapore Basketball Centre in Aljunied.
The league currently exists out of ten teams. The champions of each season are eligible to play in the qualifying rounds of the Basketball Champions League Asia.
Siglap Basketball Club and Engtat Hornets hold the record for most championships with three each.
<small>As of the 2025âÂÂ26 season.</small>
In August 2025, Corrupt Practices Investigation Bureau arrested nine people for suspected involvement in fixing matches in the league. Players were among those arrested. The match between Tagawa and Tong Whye held on 1 August was among several matches that were allegedly fixed.