- ADU stands for Abu Dhabi University (United Arab Emirates)
- ADU stands for Accessory Dwelling Unit (separate living space)
- ADU stands for Adamson University (Manila, Philippines)
- ADU stands for Application Data Unit
- ADU stands for Ammonium Diuranate
- ADU stands for Anesthesia Delivery Unit (various locations)
- ADU stands for Animal Demography Unit (University of Cape Town; South Africa)
- ADU stands for Affordable Dwelling Unit (various locations)
- ADU stands for Aironet Desktop Utility (Cisco)
- ADU stands for Air Defense Unit
- ADU stands for Automatic Dialing Unit
- ADU stands for Array Diagnostic Utility (Compaq)
- ADU stands for Air Data Unit
- ADU stands for Adapter Unit
- ADU stands for Average Daily Usage
- ADU stands for Aircraft Delivery Unit
- ADU stands for Agence de Développement et d’Urbanisme (French: Development and Planning Agency)
- ADU stands for Analog-to-Digital Unit
- ADU stands for Automatic Duplexing Unit
- ADU stands for Active Duty Unit
- ADU stands for Anti-Doping Unit (International Handball Federation)
- ADU stands for Asynchronous Data Unit
- ADU stands for Afghan Disabled Union (Taimani Kabul, Afghanistan)
- ADU stands for Application Definition Utility
- ADU stands for Audience Deficiency Unit (advertising)
- ADU stands for Azimuth Display Unit
- ADU stands for Appliance Distributors Unlimited, Inc. (est. 1982)
- ADU stands for Auxiliary Display Unit
- ADU stands for Audio Distribution Unit
- ADU stands for Antenna Drive Unit
- ADU stands for Acción Democrática Universitaria (Democratic University Action-Collegiate movement, Guatemala)
- ADU stands for Article Dashboard University
- ADU stands for ARTS Data Unit HWCI
- ADU stands for Angels Dance Upward
- ADU stands for Accumulation & Distribution Unit
- ADU stands for Activity Driver Unit
ADU