AED may refer to:

• Anhidrotic ectodermal dysplasia, a genetic disorder
• Automated external defibrillator, a portable electronic device that diagnoses and can correct arrhythmia of the heart.
• AED (non-profit), formerly known as the Academy for Educational Development
• Accident and emergency department
• Advertising elasticity of demand, a measure of the effectiveness of advertising
• AED Oil Limited, an oil exploration and production company
• ALGOL Extended for Design, an extended version of the ALGOL programming language
• Alpha Epsilon Delta (ΑEΔ), an American premedical honor society
• 5-Androstenediol, an adrenal gland hormone that stimulates marrow-cell growth
• Antiepileptic drugs, a type of medication used to treat epileptic seizures
• Atomic-emission detector, a type of chromatography detector
• Auger electron diffraction
• AED, ISO 4217 currency code of the United Arab Emirates dirham, the currency of the United Arab Emirates

Aodh , or Áed, is an Irish word of Indo-European origin, equivalent to fire in English. Aodh and its many variants is used today in the Irish and Scottish Gaelic languages as a given name for both sexes (though feminine forms are less varied and less common), and in even more variants as a family name. As a family name, the root or a variant may be prefixed by O or Ó (meaning from) or Mac or Mc (meaning son of). The masculine given name Hugh has been used as an anglicised form of Aodh, although the names are entirely etymologically unrelated. It is also the name of a Celtic sun god. A pet form of Áed is Ádhán. A modern Irish form of Ádhán is Aodhán. An older form of Aodhán is Aedán. The name Aodhagán is a double diminutive of Aodh, and a more modern Irish form of Aodhagán is Aogán. An Anglicised form of Aedán is Aidan. Variant forms of this Anglicised name are Edan, Aedan, and Aiden.