NBL

NBL may mean:

 Any of several basketball leagues named National Basketball League
 National Basketball League (Australasia), the pre-eminent men's professional basketball league in Australasia
 National Basketball League (Bulgaria)
 National Basketball League of Canada
 National Basketball League 1993-94 (Canada) (defunct)
 National Basketball League (China), a men's semi-professional basketball minor league in China
 National Basketball League (Czech Republic)
 National Basketball League (Indonesia)
 National Basketball League (Lithuania), a men's basketball minor league in Lithuania
 National Basketball League (Malaysia)
 National Basketball League (New Zealand)
 National Basketball League (United Kingdom) 1972–2003 (defunct)
 National Basketball League (United States) 1937–49 (defunct)
 National Basketball League (1898–1904) (defunct)
 Namibia Breweries Limited
 National Bicycle League (United States)
 National Blackbelt League the world's largest and most prestigious sport karate league tournament
 National Book League (United Kingdom)
 National Bowling League (United States) (defunct)
 n-Butyllithium, an organic compound.
 Neutral Buoyancy Laboratory at NASA's Johnson Space Center
 New Brunswick Laboratory
 Noble Energy, an oil and natural gas exploration and production company listed on the New York Stock Exchange with the ticker symbol NBL
 North Bay League, now part of the North Coast Section of the California Interscholastic Federation (CIF)
 North Berwick Law, a volcanic plug in East Lothian, Scotland
 North British Locomotive Company