NAD can refer to: - NAD Electronics, a Canadian audio equipment manufacturer (originally New Acoustic Dimension)
- Namibian dollar, the currency of Namibia
- National Advertising Division
- National Amusement Devices, manufactured amusement park trains
- National Animation and Design Centre, a 3D animation school in Montreal, Québec, Canada
- National Appeals Division, an agency within the United States Department of Agriculture
- National Association of the Deaf, a non-profit advocacy organization
- Ned's Atomic Dustbin, a British Rock Band
- Network Access Device, a device in mobile phones that finds the shortest route for a connection
- New Age Diamonds, a company producing cultured and synthetic diamonds of new age
- New Animal Drug, a regulatory category under section 512 of the United States Food, Drug and Cosmetics Act
- Nicotinamide adenine dinucleotide, or NADH, a coenzyme and signaling molecule, whose oxidized form is NAD+
- North American Datum, a series of geographic coordinate systems
- Norwegian Association of the Disabled
- Number Administration Deed, an agreement between New Zealand's telecommunication organizations for the management of telephone number administration
- New Approach Directives, Community Laws establishing essential requirements, technical harmonisation and standardisation, forming the basis for free movement of goods in the EU Internal Market
- No abnormality detected, medical abbreviation
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