The Czech Republic National Basketball League (NBL) is the top-tier level professional basketball league in the Czech Republic. It is run by the Asociace Ligových Klubů. The league operates under a promotion and relegation system. The bottom two NBL teams from each season's standings are relegated to the 2nd-tier level 1. Liga, while the top two 1. Liga teams from each season's standings are promoted to the NBL.

Basketball Nymburk, also known as ERA Nymburk due to sponsorship reasons, is a professional basketball team that is based in the town of Nymburk. The club plays in the top-tier level professional Czech National League (NBL). Nymburk regularly plays in European competitions, as it last participated in the Basketball Champions League.