ND may refer to:
Arts and media
- nD, a fictional alien species in Invasion: Earth (TV series)
- Nancy Drew, a fictional teenage sleuth in various media
- Naughty Dog, an American video game developer
- Notitia Dignitatum, a late Roman administrative codex
- Nuclear Dawn, a 2011 video game (once a Half-Life 2 mod)
Businesses
- Nextdoor, a hyperlocal social networking service for neighborhoods
- NetDocuments, a British document management company
- Norsk Data, a defunct Norwegian computer manufacturer
Language
- Nd (digraph), a digraph present in many African languages
- Northern Ndebele language, of Botswana and Zimbabwe (ISO 639-1:
nd)
Places
- North Dakota, a state of the United States
- New Delhi, India's capital city
- Notre Dame (disambiguation), a number of churches and colleges
- Nguyen dynasty, unified Vietnamese empire (1802–1884)
Politics
- New Democracy (Canada), a defunct party in Canada
- New Democracy (Greece), one of the main center-right liberal political parties in Greece
- National Democrats (Sweden), a far-right party in Sweden
- New Democrats (France), a left-wing party in France
- National Democracy (Poland), a former Polish political movement
- New Dawn (Algeria), a nationalist Algerian party
- Nuclear disarmament, the dismantlement and proposed dismantling of nuclear weapons
Science and technology
Mathematics
- nd (elliptic function), one of Jacobi's elliptic functions
Medicine
- NADH dehydrogenase, an enzyme
- Non-distended, an abdominal distension clinical examination value
- Naturopathic Doctor, a degree in naturopathic medicine
- Notifiable disease, any disease that is required by law to be reported to government authorities
Physics
- ND Experiment, a particle physics experiment in Novosibirsk, Russia
- nD, the refractive index of a medium at a wavelength of 589.8 nm
Other uses in science and technology
- Neighbor Discovery, an Internet protocol
- Neodymium, symbol Nd, a chemical element
- Neutral density filter, a type of filter used in photography
- Contax N Digital, a digital camera
- ND for nominal diameter in piping
- ND MX-5 Miata, the fourth generation of the Mazda MX-5
Weapons and military
- United States Navy Diver, an occupational rating
- Negligent discharge, a careless use of a firearm
- Norrland Dragoon Regiment, of the Swedish Army
- Nuclear disarmament, the proposed dismantling of nuclear weapons
Other uses
- National Diploma (Ireland), an academic qualification in the Republic of Ireland
- New Dawn (disambiguation), with various meanings
- Neurodiversity, variation in cognition and sociability (per the social model of disability)
- n.d. for "no date", an abbreviation used in APA-style and other styles of bibliographic citations
- in the International Code of Signals, denotes a tsunami warning
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