Organizations
- National Science Foundation, a U.S. government-funded agency which provides research and education in the fields of science and engineering.
- NSF International, formerly known as the 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
- Norsk Syndikalistisk Forbund, a Norwegian anarcho-syndicalist group
- Nykterhetsrörelsens Scoutförbund (The Temperance Guide and Scout Association), a Swedish scouting organization
- Norges Speiderforbund, a Norwegian scouting association
- National Sleep Foundation
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