AID may refer to:

• Activation-Induced (Cytidine) Deaminase, an enzyme
• Algebraic Interpretive Dialogue, an implemenation of JOSS II for the PDP-10
• Americans for Informed Democracy, an American non-profit organization
• Artificial Insemination by Donor, a type of human artificial insemination in which donor sperm are provided by an individual other than the recipient's partner
• Association for India's Development, an American/Indian non-profit organization

See also

• AIDS → Acquired immunodeficiency syndrome
• USAID → United States Agency for International Development