Aak or AAK may refer to:

Organizations

• AarhusKarlshamn (operating as AAK), a Swedish producer of vegetable oils and fats

• Ajnad al-Kavkaz, a Chechen-led militia in the Syrian Civil War

• Alliance for the Future of Kosovo, an alliance of political parties in Kosovo

• Architectural Association of Kenya

• Armée de l'Air Khmère (Khmer Air Force, the air force of the Khmer Republic)

• Automobile Association of Kenya

Other uses

• Aak, a genre of Korean court music

• Aak flower, madar or crown flower, common name of Calotropis gigantea

• AAK Theory, a mathematical theory relating rational functions with singular values

• Ankave language, a language of Papua New Guinea

• Aranuka Airport in Gilbert Islands, Kiribati (IATA airport code AAK)