Adi may refer to:

• A cacodemon. See list of angels in Enochian.
• The female equivalent of ratu, a Fijian title meaning "chief."
• The clan of which Umar ibn al-Khattab, the second Islamic caliph, was a member.
• The Adi people.
• The Adi language .

ADI is an acronym for Acceptable Daily Intake.