NS
- ns – (s) Nanosecond
- nS – (s) Nanosiemens
- NS – (s) Nova Scotia (postal symbol) – Suriname (FIPS 10-4 country code)
- NSA – (i) U.S. National Security Agency – Naval Support Activity – No Strings Attached
- NSABB – (i) National Science Advisory Board for Biosecurity
- NSAID – (i) Non-Steroidal Anti-Inflammatory Drug
- NSB – (i) Norges Statsbaner (Norwegian State Railways)
- NSC – National Security Council
- NSDAP – (i) Nationalsozialistische Deutsche Arbeiterpartei (German: "German National Socialist Workers Party", the formal name of the Nazi Party)
- NSDL – (i) National Science Digital Library (US)
- NSG – (i) National System for Geospatial-Intelligence
- NSN – (i) National Stock Number
- NSNA – (i) National Student Nurses' Association
- NSO – (i) National Standardization Office (ABCA)
- NSS – (i) (U.S.) Naval Simulation System
- NST – (i) (UK) Nimrod Software Team
- NSTAC – (i) National Security Telecommunications Advisory Committee
- NSV – (i) Nikitin-Sokolov-Volkov heavy machine gun (Russian НСВ Никитина-Соколова-Волкова) ru:ПулеметНСВ-12,7 "Утес"
- NSW – (i) New South Wales (postal symbol)
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