- AEFI stands for Adverse Events Following Immunization
- AEFI stands for Asociación Española de Farmacéuticos de la Industria
- AEFI stands for Associazione Esposizioni e Fiere Italiane (Italian: Italian Exhibition and Trade Fair Association)
- AEFI stands for Air and Space Expeditionary Force Indicator (US Air Force)
- AEFI stands for Adverse Effect Following Immunization
- AEFI stands for Association des Etudiants Francophones de Iasi (Romania)
- AEFI stands for Acute Esophageal Food Impaction
AEFI