ADA

ADA or AdA may refer to:

Note: the entries in each section are grouped and ordered in correspondence with the categories in each heading.

Accessibility, medicine, biology, and chemistry

Americans with Disabilities Act of 1990, a US law that prohibits discrimination on the basis of disability
Adaptive Design Association, New York City based non-profit designing and fabricating adaptive devices for disabled persons
American Dental Association
Australian Dental Association
American Dietetic Association, the former name of the Academy of Nutrition and Dietetics
American Diabetes Association
Adenosine deaminase, an enzyme involved in purine metabolism
ADA (buffer), a chemical buffer in the physiological range
Azodicarbonamide, a food additive also used in plastics production

Alternative Distribution Alliance, a music distributor owned by Warner Music Group
Australian Digital Alliance, a copyright advocacy group
Apple Design Awards, an event at the Apple Worldwide Developers Conference
ADA, a cryptocurrency on the Cardano blockchain platform
Ada (programming language), a high-level computer programming language
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
ADA (smart antenna), an Israeli adaptive antenna

Airline Deregulation Act, a 1978 US law removing governmental control from commercial aviation
Adana Şakirpaşa Airport (IATA code)
Aerolínea de Antioquia, a Colombian Airline
Aeronautical Development Agency, an agency of India's Ministry of Defence
Armée de l'Air, the French Air Force
Air Defense Artillery Branch, a branch of the US Army specializing in anti-aircraft weapons
Angehöriger der Armee (AdA), a person on active duty in the Swiss Armed Forces

American Decency Association, an advocacy group against pornography
Americans for Democratic Action, a liberal advocacy organization
After the Development of Agriculture, a system of counting years
Amazon Development Agency, a development agency in Brazil
Austrian Development Agency, a development aid agency
Association of Drainage Authorities, a membership body for those involved in water level management in the UK

Antideficiency Act, a US law that prohibits the federal government from incurring debts not authorized by Congress
Assistant district attorney, a US government position
Amigos dos Amigos, a drug cartel in Rio de Janeiro
ADA collider, an electron–positron collider
Dangme language (ISO 639-2 and ISO 639-3 codes)
Asociación Deportiva Agropecuaria, a football club based in the city of Jaén, Cajamarca, Perú