AEO

AEO may refer to:


 * Authorized economic operator, a WCO standard to secure and facilitate global trade
 * American Eagle Outfitters, an American clothing and accessories retailer
 * Appearance event ordination, a dating system for land mammal fossils
 * Alternative episcopal oversight, ecclesiastical systems through which certain churches are provided with a different bishop
 * Adaptive Execution Office of DARPA (US military)
 * Aioun el Atrouss Airport (IATA airport code: AEO) in Mauritania