AEK may refer to:
- AEK, a sports club from Athens, Greece, the best known club by this name. Most clubs with the name "AEK" copied the Athens club's name.
- AEK F.C., the association football team
- AEK B.C., the association basketball team
- AEK V.C., the men's volleyball team
- AEK Women's V.C., the women's volleyball team
- AEK H.C., the handball team
- AEK Futsal, the futsal team
- AEK-971, a Russian assault rifle
- AEK-999, a Russian machine gun
- AEK Larnaca FC, an association football club in Larnaca, Cyprus
- AEK Kouklia, an association football club in Kouklia, Cyprus, dissolved in 2014
- Apple Extended Keyboard, a computer keyboard
- Haeke language
- Aseki Airport, an airport in Papua New Guinea (see: List of airports by IATA code: A)
- Alfabetatze Euskalduntze Koordinakundea