ADU or Adu may refer to:

Universities[edit]

• Abu Dhabi University
• Adamson University of Manila
• Afghan Defense University, now called Marshal Fahim National Defense University
• ArsDigita University at MIT
• Animal Demography Unit, University of Cape Town

Other uses[edit]

• Accessory dwelling unit or secondary suite
• Adu (surname)
• Adú, 2020 Spanish film
• Ammonium diuranate
• Analog-to-digital converter or Analog-to-digital unit
• Application discovery and understanding
• Ardabil Airport, Iran