NBS can stand for:
- N-Bromosuccinimide, a chemical reagent
- Nagano Broadcasting Systems, a television broadcasting network in Nagano Prefecture, Japan
- The NASCAR Busch Series
- A Nash bargaining solution, in economics, a solution to a Nash bargaining game
- The National Bank of Serbia (Narodna Banka Srbije, Народна Банка Србије)
- The National Bank of Slovakia (Národná banka Slovenska)
- The National Bank of Samoa Fale Tupe Tagata Nuu O Samoa, privately owned bank in Samoa.
- The National Blood Service, an organization within the UK's NHS
- The National Broadcasting School, an educational institution in the UK
- The National Broadcasting System, a fictional television network in the TV series Studio 60 on the Sunset Strip
- The National Brotherhood of Skiers
- The National Building Specification, standard of building specifications in the United Kingdom
- The National Bureau of Standards, which is, today, called National Institute of Standards and Technology (NIST) in the U.S.
- The National Bureau of Statistics in China
- The National Bureau of Statistics of Tanzania
- The National Library of Serbia (Narodna Biblioteka Srbije, Народна Библиотека Србије)
- Nationwide Building Society
- Nelson Building Society
- Neubaustrecke, name for the high-speed rail lines built in Germany
- Newcastle Building Society
- Nicole Brown Simpson
- Nijmegen breakage syndrome, a genetic medical condition
- Nippon Broadcasting System, a radio station managed also under Fuji TV Network (Japan)
- .nbs is the extension for Netbeans Schliemann files, a language for specifying language syntax.
- No-Big-Silence, an Estonian Industrial Metal/Rock band.