'NDA' is an abbreviation that may refer to:
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Non-disclosure agreement, a legal term
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Next-Day Air, a specification for shipping
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New Drug Application, the application needed to get a new drug approved in the United States by the Food and Drug Administration
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National Democratic Alliance, a political term
★ National Democratic Assembly, the English name of the Israeli political party
Balad
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Nuclear Decommissioning Authority, an entity of the UK government
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Northern Domestic Airspace, a Canadian aviation organization
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Ninth Doctor Adventures - a series of books based on ''Doctor Who''
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National Defence Academy (India), a military academy in India
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National Defense Academy of Japan, a military academy in Japan
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National Disability Authority, an agency of the Irish Department of Justice
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Nicolas Dupont-Aignan, a French politician
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Non-Destructive Assay, a way to test, measure, or evaluate a material's properties without destroying it
★ Nothing Does Anything, an
algorithm used by philosophers to determine the relative activity of existence