ND

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
 * Neues Deutschland, or nd, a German daily newspaper

Language

 * Nd (digraph), a digraph present in many African languages
 * Northern Ndebele language, of Botswana and Zimbabwe (ISO 639-1: )

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

 * National Democracy (Poland), a political movement 1886–1947
 * National Democrats (Sweden), a far-right party 2001–2014
 * New Dawn (Algeria), a nationalist party formed in 2012
 * New Democracy (Canada), an economic reform party 1939–1940
 * New Democracy (Greece), a center-right party formed in 1974
 * New Democracy (North Macedonia), a conservative ethnic Albanian party formed in 2008
 * New Democrats (France), a left-wing party 2020–2022
 * Nuclear disarmament, the dismantlement and proposed dismantling of nuclear weapons

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