ADT

• Air Departure Tax, in Scotland • IATA airport code for Ada Municipal Airport in Oklahoma, United States == Organizations and enterprises==

• Abu Dhabi Terminals, abbreviated ADT, port operator for all commercial ports in Abu Dhabi • Adirondack Trailways, an American bus company • ADT College, in London • ADT Inc., formerly American District Telegraph, which provides residential and small business electronic security and similar services in many countries ==People==

• Ana de Teresa (born 2001), Spanish footballer known as ADT • Harro Adt (born 1942), German diplomat • Katrin Adt (born 1972), German business executive ==Places==

• American Discovery Trail, a system of recreational trails in the United States == Science and technology==

Biology and medicine • Androgen deprivation therapy, a common component of treatment for prostate cancer • Arogenate dehydratase, an enzyme • Azadithiolate cofactor, an organosulfur compound found in some enzymes Computing • Abstract data type • Algebraic data type, a composite type in computer programming • Alternating decision tree, a machine learning method • Android Development Tools, a plugin for the Eclipse IDE • Asynchronous data transfer Technology • Active Denial Technology, a non-lethal, directed-energy weapon developed by the U.S. military • Admission, discharge, and transfer system, a system for the structure of other types of business systems • Automatic double tracking, an audio recording technology ==Sports==

• Asian Development Tour, a golf tour • Asociación Deportiva Tarma, a Peruvian association football club • Azkals Development Team, a Filipino football club == Other uses==

• adt, one of two ISO 639-3 codes for the Adnyamathanha language, an Australian Aboriginal language • American death triangle, a deprecated rock climbing anchor system • Atlantic Daylight Time • Average Daily Theoretical (also known as "theoretical loss" or "theo"), a calculation used to determine gamblers' casino comps • Average Daily Traffic, used in transportation planning • Advanced Dvorak Technique - a technique developed on the basis of the Dvorak technique to estimate the intensity of tropical cyclones