NAF or Naf may refer to:

Organizations

• NAF (non-profit organization), a U.S. education non-profit organization formerly known as National Academy Foundation
• National Abortion Federation, a U.S. organization of abortion providers
• National Academies Forum, the peak body for the four learned academies in Australia
• Netherland-America Foundation, an organization which supports exchange between the United States and The Netherlands
• New America Foundation a Washington, DC-based think tank
• Norwegian Automobile Federation, an association of car owners
• Norwegian Employers' Confederation
• Norwegian Union of General Workers
• National Arbitration Forum, a U.S. arbitration and mediation firm
• Nordisk Andels Forbund ("Nordic Coöp Federation"), the predecessor to Coop Norden

Defense

• Nigerian Air Force
• NATO Architecture Framework, an architecture framework used by NATO
• Naval Air Facility, a lower-level naval air station in the United States Navy
• Naval Aircraft Factory, operated in Philadelphia from 1918 to 1945
• Numbered Air Force in the United States Air Force
• United Armed Forces of Novorossiya, Eastern Ukrainian pro-Russian separatists fighting the Ukrainian government for independence

Science and mathematics

• Negation as failure, logic in which a statement that cannot be shown to be true is considered false rather than unknown
• Non-adjacent form, a signed-digit representation of numbers in mathematics and cryptography
• Sodium fluoride, a chemical compound whose formula is NaF
• Neutrophil-activating factor

Other uses

• National Academy Foundation School, a public high school located in Baltimore, Maryland
• Native American flute, an end-blown flute from North America
• North Anatolian Fault, Turkey
• Naf River, a river between Bangladesh and Myanmar
• Nice As Fuck, an American indie rock band
• Nuffle Amorical Football, fictional governing body for the fantasy football game Blood Bowl
• Netherlands Antillean guilder, often shortened to NAf