ADT
ADT or Adt may refer to:

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
Ada Municipal Airport, airport in Oklahoma (IATA: ADT)
American Discovery Trail, a system of recreational trails in the United States

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

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
Air Data Terminal or Airborne Data Terminal

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
Air Departure Tax, in Scotland
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