NSF may refer to:

Politics

• National Service Framework, any of a series of British government policies on medical care
• National Socialist Front, a Swedish Nazi party
• NS-Frauenschaft, the women's wing of the former German Nazi party
• National Student Forum, a British government consultative body (founded in 2008)
• National Students Federation, a leftist Pakistani students' political group.

Organizations

• National Science Foundation, a U.S. government-funded agency which provides research and education in the fields of science and engineering.
• National Sanitation Foundation, a non-profit organization which provides research and education in the field of public health and safety.
• North South Foundation, a non-profit organization providing scholarships to Indian students living in the United States

Biology

• Nephrogenic Systemic Fibrosis, a serious dermatopathic disease
• N-ethylmaleimide sensitive fusion protein, an enzyme in eukaryote cytoplasms (and its associated gene)

Architecture

• Net Square Feet

Computing

• NES Sound Format (.nsf), an audio file format for the Nintendo Entertainment System
• Non-Symbolic Fragmentation, a bit-level transposition cipher
• Notes Storage Format (.nsf), the file type for Lotus Notes databases
• National Standard Format, a file format for health care claim submission

Entertainment

• Ninja Strike Force, a 1988 martial-arts film
• National Secessionist Forces, a fictional terrorist group from the Deus Ex video game
• Niggaz Strictly Flowin' (a.k.a. New Skoo' Foolz), a Chicago-based Hip hop group formed in 1993.

Military

• National Service Full-time, a full-time conscript in Singapore
• Naval Support Facility, a base for the United States Navy
• National Strike Force, The U.S. Coast Guard's response team for oil spills and other HAZMAT incidents

Scouting

• Nykterhetsrörelsens Scoutförbund (The Temperance Guide and Scout Association), a Swedish scouting organization
• Norges Speiderforbund, a Norwegian scouting association

Banking

• Non-sufficient funds, a U.S. banking expression indicating an account lacks the necessary money to honor a check

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