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AE, Ae, ae, aE, Æ or æ may refer to:

Language

Æ or æ, a ligature or letter
- List of English words that may be spelled with a ligature, including "AE" being rendered as "Æ"
Ä or ä, a letter sometimes represented as "ae"
Ae (Cyrillic), a Cyrillic-script letter
Ae (digraph), a Latin-script digraph

American English, varieties of the English language native to the US; abbr. AE, usually used in contrast to BE (British English)
Avestan, a language, ISO 639-1 language code ae

Ae, Dumfries and Galloway, Scotland
- Water of Ae, a river
Algeria, LOC MARC code
United Arab Emirates, ISO 3166-1 and FIPS 10-4 country code AE
- .ae, the top level domain for United Arab Emirates
US armed forces in Europe (United States postal abbreviation AE)

A. E. or Æ, a penname of George William Russell (1867–1935), Irish writer
A. E. Holt White (1851–1933), English writer and illustrator
A. E. van Vogt (1912–2000), Canadian-American science-fiction writer
Anne Ellis (1875–1938), American writer
Alexander Emelianenko (born 1981), Russian mixed martial artist, with AE Team

Acoustic emission, the phenomenon of radiation of acoustic waves in solids
Adobe After Effects, graphics software
Adverse event, any untoward medical occurrence in a patient or clinical investigation
Aeon in astronomy, 10⁹ years
Almost everywhere, in mathematical analysis
ASCII Express, computer software
Authenticated encryption, a form of encryption
Automatic exposure, a mode available on some cameras
- Canon AE-1, a camera

Æ or AE, a numismatic abbreviation for "bronze"
American Eagle, a fashion company abbreviated as AE
Air Efficiency Award, a British medal 1942–1999
A US Navy hull classification symbol: Ammunition ship (AE)
Applied Engineering, a computer hardware retailer
Mandarin Airlines, a Taiwanese airline, IATA designator AE
Toyota Corolla, which the "AE" designation is applied to those with Toyota A engine
Adult education
Madiun, Ngawi, Magetan, Ponorogo and Pacitan (vehicle registration prefix AE)