NSV or nSv may refer to:

Nationalist organisations

• National Socialist Vanguard, a US neo-Nazi group
• Nationalistische Studentenvereniging, the Flemish Nationalist Student Association
• Nationalsozialistische Volkswohlfahrt, the Nazi People's Welfare Organization
• National-Social Association, a political party of the former German empire, initials NSV

Science and technology

• Nullsoft Streaming Video format
• New Catalogue of Suspected Variable Stars
• Nanosievert, a unit of radiation
• Newton–Størmer–Verlet method in mathematics
• No scalpel vasectomy

Other

• Nürnberger-Spielkarten-Verlag, German game and playing card manufacturer
• NSV machine gun, Soviet, 12.7 mm
• Neighbourhoods for a Sustainable Vancouver, British Columbia, Canada