ADA

ADA may refer to:

Nonprofit organizations

Airline Deregulation Act, a 1978 US law removing governmental control from commercial aviation
Americans with Disabilities Act of 1990, U.S. law that prohibits discrimination on the basis of disability
Antideficiency Act, U.S. law that prohibits the federal government from incurring debts not authorized by Congress
Assistant District Attorney, US government attorney position

Aeronautical Development Agency, agency of India's Ministry of Defence
Air Defense Artillery Branch (United States), a branch of the U.S. Army specializing in anti-aircraft weapons
Armée de l'Air, the French Air Force
Angehöriger der Armee or AdA, a member of the Swiss Armed Forces

Amazon Development Agency, a development agency in Brazil
Association of Drainage Authorities, membership body for those involved in water level management in the United Kingdom
Austrian Development Agency, a development aid agency

Aerolínea de Antioquia, a Colombian Airline
Alternative Distribution Alliance, music distributor owned by Warner Music Group

ADA collider, the first electron–positron collider
Ada (programming language), a high-level computer programming language
Adenosine deaminase, an enzyme involved in purine metabolism
Advanced Distribution Automation, the extension of intelligent control over an electrical power grid
Analog-to-digital converter/Digital-to-analog converter, seen as ADA or A/DA, conversion occurring 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... A Way of Life, 2008 Bollywood musical by Tanvir Ahmed
Adana Şakirpaşa Airport's IATA code
Adangme language's ISO 639-2 code
After the Development of Agriculture or A.D.A., a system of counting years, like Anno Domini and Anno Mundi
Amigos dos Amigos, a drug cartel in Rio de Janeiro