ADA or AdA may refer to:
Organizations
- Amazon Development Agency, a development agency in Brazil
 - American Decency Association, an advocacy group against pornography
 - American Dental Association
 - American Diabetes Association
 - American Dietetic Association, the former name of the Academy of Nutrition and Dietetics
 - Americans for Democratic Action, a liberal advocacy organization
 - Amigos dos Amigos, a drug cartel in Rio de Janeiro
 - Association of Drainage Authorities, a membership body for those involved in water level management in the UK
 - Australian Digital Alliance, a copyright advocacy group
 - Australian Dental Association
 - Austrian Development Agency, a development aid agency
 
Businesses
- Aerolínea de Antioquia, a Colombian Airline
 - Alternative Distribution Alliance, a music distributor owned by Warner Music Group
 
Military
- Aeronautical Development Agency, an agency of India's Ministry of Defence
 - Air Defense Artillery Branch, a branch of the U.S. Army specializing in anti-aircraft weapons
 - Angehöriger der Armee (AdA), a person on active duty in the Swiss Armed Forces
 - Armée de l'Air, the French Air Force
 
Science and technology
- ADA, a cryptocurrency
 - ADA collider, an electron–positron collider
 - Ada (programming language), a high-level computer programming language
 - Adenosine deaminase, an enzyme involved in purine metabolism
 - Advanced Distribution Automation, an extension of intelligent control over an electrical power grid
 - Analog-to-digital converter (ADA or A/DA), an electronic converter in some electronic devices, often musical
 - Apple Design Awards, an event at the Apple Worldwide Developers Conference
 - Azodicarbonamide, a food additive also used in plastics production
 - ADA (buffer), a chemical buffer in the physiological range
 
Law
- Airline Deregulation Act, a 1978 US law removing governmental control from commercial aviation
 - Americans with Disabilities Act of 1990, a U.S. law that prohibits discrimination on the basis of disability
 - Antideficiency Act, a U.S. law that prohibits the federal government from incurring debts not authorized by Congress
 - Assistant District Attorney, a US government attorney position
 
Other uses
- Adana Şakirpaşa Airport (IATA code)
 - After the Development of Agriculture (A.D.A.), a system of counting years
 - Dangme language (ISO 639-2 and ISO 639-3 codes)
 - Asociación Deportiva Agropecuaria, a football club based in the city of Jaén, Cajamarca, Perú
 
See also
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