Aisa

Aisa or AISA may refer to:
 * Aisa (fate), the Homeric Moira or Atropos, one of the three Fates
 * Aisa (portion), an Homeric word similar with Moira (part or portion)
 * Aísa, a town in Spain
 * Aesa, a town of ancient Macedonia
 * Aisa (leafhopper), a leafhopper genus in the tribe Erythroneurini
 * Aeronáutica Industrial S.A., a Spanish aeronautical company
 * Afghanistan Investment Support Agency
 * Alabama Independent School Association, which was created to support segregation academies in Alabama
 * All India Students Association
 * American International School, Abu Dhabi
 * American International School of Abuja
 * American International School of Algiers
 * Association of International Schools in Africa