AAD

AAD may refer to:

Organizations

 * Ad Altare Dei, a Boy Scouts of America award
 * Advanced Automotive Design, a South African car manufacturer
 * Ardent Leisure, an Australian-based leisure company
 * AAD Education, Health and Sports (formerly, Athletes Against Drugs), an organization founded by Stedman Graham
 * American Academy of Dermatology
 * Australian Antarctic Division, which manages Australia's four Antarctic/sub-Antarctic stations, as well as Heard Island

Science and technology

 * Average absolute deviation, a measure of absolute deviation and a way to report error against reference data in statistics
 * Advanced Air defence, an anti-ballistic missile in the Indian Ballistic Missile Defence Programme

Aviation

 * Automatic activation device, a fail-safe device often used in a parachute pack
 * Adado Airport, airport serving Adado, Somalia (IATA code: AAD)

Computing

 * aad, or "ASCII Adjust before Division", one of the Intel BCD opcodes
 * AAD, the SPARS code for a CD that was recorded analog, mixed analog, and transferred digitally
 * Additional authenticated data passed to an "Authenticated Encryption with Associated Data" (AEAD) block cipher mode of operation
 * Microsoft Azure active directory

Medicine

 * Antibiotic-associated diarrhea
 * 7-Aminoactinomycin D (7-AAD), a fluorescent stain for DNA
 * Acute aortic dissection, a type of Aortic dissection
 * Antiarrhythmic drug, another name for antiarrhythmic agent

Other uses

 * Amal language, a language of Papua New Guinea
 * Attitude-toward-the-ad models in marketing is a way of measuring the success of an advertisement
 * Africa Aerospace and Defence, an annual trade show in South Africa