BS Leiden, mostly known for sponsorship reason as Zorg en Zekerheid Leiden or ZZ Leiden, is a basketball club based in Leiden, Netherlands that plays in the Dutch first division Dutch Basketball League (DBL). Their home games are played at Vijf Meihal, which has 2,000 seats.ZZ Leiden has won the national championship 3 times, the NBB Cup 2 times, the Dutch Basketball Supercup 2 times.