AK

AK may refer to:
* Alaska, a state in the United States (see United States postal abbreviations)
* applied kinesiology, a method using manual muscle testing that purportedly gives feedback on the functional status of the body
* Alicia Keys, singer.
* actinic keratosis, a skin condition
* AK, the US Navy hull classification symbol for Cargo Ship
* Armia Krajowa ("Home Army"), underground resistance in Nazi-occupied Poland during World War II
* AK-47 (Avtomat Kalashnikova model 1947 g.), Russian rifle or one of its variants such as the AK-74, AK-101, AK-103, or AK-107
* AK, the IATA code for AirAsia based in Malaysia
* Ace-King, a card combination in Poker
* Patient AK, a 16 year old female patient who laughed when her brain was stimulated with electric current during treatment for epilepsy
* "A.K." (1985), a film directed by Chris Marker about the making of Akira Kurosawa's "Ran" (1985)
* "AK Press", a collectively owned and operated independent publisher and book distributor that specialises in radical and anarchist literature
* AK (Radio Program), a weekly broadcast produced by Alaska Public Radio
*Knight of the Order of Australia, a chivalric award, defunct since 1986
* "AK", "Arbeiterkammer", in English the Austrian Chamber of Labour
* AK, the Turkish Justice and Development Party, from its Turkish name, "Adalet ve Kalkınma Partisi"
* In falconers' usage, "American kestrel" (a species of bird of prey)
* In database theory, Alternate key, an attributes set capable to identify a recordset not used as primary key

aK may refer to:
* attokelvin, an SI unit of temperature

ak may refer to:
* Akan language (ISO 639 alpha-2)

Ak may refer to:
* Ak, the Master Woodsman of the World in L. Frank Baum's "The Life and Adventures of Santa Claus"
* Ak, the nickname for bassist Steve Jay, of the ethno-funk duo, Ak & Zuie (and "Weird Al" Yankovic's bassist)