AD (disambiguation)

• A.D. (film), a 2010 animated zombie horror film
• A.D. (miniseries), a 1985 television miniseries set in ancient Rome
• A.D. The Bible Continues, a 2015 biblical drama television miniseries
• Arrested Development, an American television sitcom
• Attarintiki Daredi, 2013 Indian film by Trivikram Srinivas
• Audio description, a service for visually impaired audience on some TV programs

• AD (band), a Christian rock band
• A.D. (album), by Solace

• AD (poem), by Kenneth Fearing
• A.D.: New Orleans After the Deluge, a nonfiction graphic novel about Hurricane Katrina
• Algemeen Dagblad, a Dutch newspaper
• Architectural Digest, an interior design and landscaping magazine

• Audio description track, a narration track for visually impaired consumers of visual media

• Alexander Dennis, a British bus manufacturer
• Akcionersko društvo (aкционерско друштво), a Macedonian name for a type of company
• Aktsionerno drujestvo (акционерно дружество), a Bulgarian name for a type of company
• akcionarsko društvo (aкционарско друштво), a Serbian name for a type of company
• Analog Devices, a semiconductor company

• Artist diploma, a music performance certificate conferred by higher education institutions.

• Accidental discharge, a mechanical failure of a firearm causing it to fire
• Active duty, a status of full duty or service, usually in the armed forces
• Air defense, an anti-aircraft weaponry and systems
• Air Department, part of the British Admiralty
• A US Navy hull classification symbol: Destroyer tender (AD)
• AD Skyraider, former name of the Douglas A-1 Skyraider, a Navy attack aircraft

• Action Directe, a French far-left militant group
• Democratic Action (Venezuela) ({{langx|es|Acción Democrática|link=no}}), a social democratic and center-left political party
• Democratic Alliance (Portugal, 1979) ({{langx|pt|Aliança Democrática|link=no}}), a former centre-right political alliance
• Democratic Alternative (Malta) ({{langx|mt|Alternattiva Demokratika|link=no}}), a green political party

• Ad (name), a given name, and a list of people with the name
• ‘Ad, great-grandson of Shem, son of Noah
• Anthony Davis (born 1993), American basketball player
• A. D. Loganathan (1888–1949), officer of the Indian National Army
• A. D. Whitfield (born 1943), American football player
• A. D. Winans (born 1936), American poet, essayist, short story writer and publisher
• A.D., nickname of Adrian Peterson (born 1985), American football player

• AD, ISO 3166-1 country for Andorra
• Abu Dhabi, capital of the United Arab Emirates
• AD, herbarium code for the State Herbarium of South Australia
• Andhra Pradesh, a state in southern India (HASC code)

• Art director, for a magazine or newspaper
• Assistant director, a film or television crew member
• Athletic director, the administrator of an athletics program

• Addison's disease, an endocrine disorder
• Adenovirus, viruses of the family Adenoviridae
• Alzheimer's disease, a neurodegenerative disease
• Anaerobic digestion, processes by which microorganisms break down biodegradable material
• Anti-diarrheal, medication which provides symptomatic relief for diarrhea
• Aortic dissection, which occurs when an injury to the innermost layer of the aorta allows blood to flow between the layers of the aortic wall, forcing the layers apart
• Approximate digestibility, an index measure of the digestibility of animal feed
• Atopic dermatitis, form of skin inflammation
• Atypical depression, a type of depression
• Autosomal dominant, a classification of genetic traits
• Autonomic dysreflexia, a potential medical emergency

• Adamantyl, abbreviated "Ad" in organic chemistry
• Sharpless asymmetric dihydroxylation, a type of organic chemical reaction

• .ad, the top level domain for Andorra
• Administrative distance, a metric in routing
• Active Directory, software for the management of Microsoft Windows domains
• Administrative domain, a computer networking facility
• Analog-to-digital converter, a type of electronic circuit
• Automatic differentiation, a set of computer programming techniques to speedily compute derivatives
• AD₁₆, the hexadecimal number equal to decimal number 173

• Adjoint representation of a Lie group, abbreviated "Ad" in mathematics
• Axiom of determinacy, a set theory axiom

• Antiproton Decelerator, a device at the CERN physics laboratory
• Autodynamics, a physics theory

• Active disassembly, a technology supporting the cost-effective deconstruction of complex materials

• AD, IATA code for:
• Air Paradise, a defunct Indonesian airline
• Azul Brazilian Airlines
• Airworthiness Directive, an aircraft maintenance requirement notice

• ʿĀd, an ancient Arab tribe, mentioned in the Quran
• Aggregate demand, in macroeconomics
• Anno Diocletiani, an alternative year numbering system
• United States Academic Decathlon, a high school academic competition

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• Anno Domini (disambiguation)
• BC (disambiguation)
• Domino (disambiguation)
• Dominus (disambiguation)
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