AAD
- 'Ad (disambiguation)
- 7-Aminoactinomycin D
- AD (disambiguation)
- AEAD block cipher modes of operation
- Adado Airport
- Additional authenticated data
- Advanced Automotive Design
- Africa Aerospace and Defence Expo
- Amal language
- American Academy of Dermatology
- Antibiotic-associated diarrhea
- Aortic dissection
- Ardent Leisure
- Attitude-toward-the-ad models
- Australian Antarctic Division
- Automatic activation device
- Indian Ballistic Missile Defence Programme
- Intel BCD opcodes
- Microsoft Azure Active Directory
- Religious emblems programs (Boy Scouts of America)
- SPARS code
- Stedman Graham