AD (disambiguation)
- .ad
- 173 (number)
- A. D. Loganathan
- A. D. Whitfield
- A. D. Winans
- A.D. (album)
- A.D. (film)
- A.D. (miniseries)
- A.D. The Bible Continues
- AD
- AD (band)
- AD (poem)
- AD Skyraider
- Abu Dhabi
- Accidental discharge
- Action Directe
- Active Directory
- Active disassembly
- Active duty
- Ad
- Ad (name)
- Adamantyl
- Addison's disease
- Adenovirus
- Adjoint representation
- Administrative distance
- Administrative domain
- Adrian Dantley
- Adrian Peterson
- Aggregate demand
- Air Department
- Air Paradise
- Air defense
- Airworthiness Directive
- Alexander Dennis
- Algemeen Dagblad
- Alzheimer's disease
- Anaerobic digestion
- Analog Devices
- Analog-to-digital converter
- Andhra Pradesh
- Andorra
- Anno (video game series)
- Anno Diocletiani
- Anno Domini (disambiguation)
- Anthony Davis
- Anti-diarrheal
- Antiproton Decelerator
- Aortic dissection
- Approximate digestibility
- Architectural Digest
- Arrested Development
- Art director
- Artist diploma
- Assistant director
- Athletic director
- Atopic dermatitis
- Attarintiki Daredi
- Atypical depression
- Audio description
- Autodynamics
- Automatic differentiation
- Autonomic dysreflexia
- Autosomal dominant
- Axiom of determinacy
- Azul Brazilian Airlines
- BC (disambiguation)
- Democratic Action (Venezuela)
- Democratic Alliance (Portugal, 1979)
- Democratic Alternative (Malta)
- Dissection (medical)
- Domino (disambiguation)
- Hierarchical administrative subdivision codes
- List of auxiliaries of the United States Navy
- Sharpless asymmetric dihydroxylation
- State Herbarium of South Australia
- Tunica intima
- Types of business entity
- Types of business entity
- Types of business entity
- United States Academic Decathlon
- ʿĀd
- ‘Ad