NSA may refer to:Naczelny Sad Administracyjny, the Polish Administrative High Court
National Safety Associates, a Tennessee-based multilevel marketing company which manufactures air/water filters and nutritional supplements such as Juice Plus
National Scrabble Association, a group of Scrabble players
National Security Advisor (Canada), a Canadian government position
National Security Advisor (India), an Indian government position
National Security Advisor (United States), a U.S. government position
National Security Agency, a United States governmental agency
National Security Archive, a nongovernmental research institution at George Washington University
National Security Area, a designated airspace through which flight is discouraged in the
United StatesNational Sheriffs' Association, an organization of law enforcement specialists in the United States
National Spiritual Assembly, an administrative body of the Bahá'í Faith.
National Sports Academy of
BulgariaNational Student Association, an American student organisation from the 1940s-'70s
National Supers Agency, organization of superheroes from the film The IncrediblesNatuurwetenschappelijke Studievereniging Amsterdam, Dutch name of the Association of Physics and Astronomy Students AmsterdamNaval Support ActivityNetwork Spinal Analysis, a holistic form of chiropracy.Neurological Society of Australasia
New Saint Andrews College in Idaho
New Series Adventures (Doctor Who), a series of novels based on the television programme Doctor Who
Nichiren Shoshu of America, an earlier name for the USA division of present-day Soka Gakkai International
No Strings Attached, used in personal advertisementsNo such address used as an explanation for returning
Dead letter mailNon standard analysis, in mathematics
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