and '''Ad''' may refer to:
- Anno Domini , Latin for "In the Year of (Our) Lord", applied to years in the Julian and Gregorian calendars following 1 BC
- Advertisement , the promotion of an item, service, company, and/or idea
- Arrested Development (TV Series) , a Fox Network TV program
- American Dad! , a Fox Network Animated Program
- Assistant Director , a film crew member who manages various tasks
- Art Director , the administrator in charge of art
- Athletic Director , the administrator of the athletics program, usually at an educational institution
- AD (band) , a Christian rock band from 1984-1988
- A. D. (television) , a 1985 miniseries concerning early Christian history
- Algemeen Dagblad , a Dutch newspaper
- Anno Domini (gallery) , a contemporary art gallery in San Jose, California
- Academic Decathlon , a United States high school based academic competition
- "at", "to", or "for", in some Latin Phrases (such as ''ad lib'' or ''ad nauseam'')
- AD Music , a record label
- Air Defence , anti-aircraft weaponry and systems
- Accidental Discharge , the mistaken firing of a firearm
- Active Duty , a status of full duty or service, usually referencing full service in the armed forces
- Destroyer Tender (US Navy Hull Classification: AD), support ships to aid the operation of a fleet of destroyers
- The Air Department , part of the British Admiralty
- Adenovirus , viruses of the family Adenoviridae.
- Alzheimer's Disease , a disease leading to the degeneration of neural function and dementia, usually seen in older people
- Active Directory , a Microsoft administration program
- Aggregate Demand , the total demand curve of an entire economy that is the sum of each individual's demand
- Automatic Differentiation , a way to speedily compute derivatives in computer programming
- Axiom Of Determinacy , a set theory axiom inconsistent with the Axiom of Choice
- Autodynamics , an alternate to special relativity proposed by Ricardo Carezani in physics
- Audio Description , a narration track for blind and visually impaired viewers of media such as TV and film
- Administrative Domain , a collection of hosts and routers into one network
- Analog Devices , a multinational producer of semiconductor devices.
- Analog-to-digital Converter (A/D), a circuit which converts continuous analog signals to discrete digital values
- Active Disassembly , a technology involving specially designed building materials and components which are sturdy yet can easily be decomposed
- Autonomic Dysreflexia , a condition in which "unreachable" parts of the Nervous System (for instance, those beneath a damaged spine) malfunction
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