AEX may refer to:

• AEX index (Amsterdam Exchange index), a stock market index
• ISO 639:aex, a spurious-language code retired in 2008
• Alexandria International Airport (Louisiana), United States by IATA code

• AEX cfiXML, an automated information-exchange schema for engineered equipment
• Hexachaeta aex, a species of fruit fly
• AEXS (aromatase excess syndrome), a rare condition that results in excess estrogen