NSB explained

NSB may refer to:

Art, entertainment, and media

Natural Snow Buildings, a French experimental music duo
Nihilist Spasm Band, Canadian free improvisation musical collective
Nu skool breaks, a subgenre of breakbeat music originating during the period between 1998 and 2002
Nature Structural & Molecular Biology, an academic journal
Nippon Shortwave Broadcasting (now Radio Nikkei), a domestic commercial shortwave radio station in Japan

FBI National Security Branch, the United States Federal Bureau of Investigation's branch responsible for investigating threats to national security
National Seamen Board of the Philippines
National Science Board, the governing body of the National Science Foundation
National Security Bureau (Republic of China), the intelligence agency of the Republic of China (Taiwan)
National Socialist Bloc, an historical political movement in Sweden
National Socialist Movement in the Netherlands (Nationaal-Socialistische Beweging), a fascist political movement in the Netherlands (1931–1945)
Naval Submarine Base (United States):
- Naval Submarine Base Kings Bay
- Naval Submarine Base New London
Norwegian State Railways (1883–1996), a former state-owned railway company that operated most of the railway network in Norway
Vy, formerly Norwegian State Railways (Norges Statsbaner), a government-owned railway company which operates most passenger train services in Norway

- National Savings Bank (Sri Lanka)
- Nevada State Bank, a bank in the United States
New Smyrna Beach, Florida, a city in the United States
Newtown Savings Bank, a bank in the United States
Normans Bay railway station, a railway station in Sussex, England