IK or Ik may refer to: Businesses and organizations IK Investment Partners, a European private equity firm Imair Airlines (IATA code IK) Iparretarrak, a Basque nationalist organization Languages Ik language (ISO 639 alpha-3 ikx), spoken by the Ik people of Uganda Inupiaq language (ISO 639 alpha-2), a group of dialects of the Inuit language, spoken in Alaska Places Ik (river), a tributary of the Kama in Bashkortostan and Tatarstan, Russia Ik (Berd), a tributary of the Berd in Novosibirsk Oblast, Russia Bolshoy Ik, a tributary of the Sakmara in Bashkortostan and Orenburg Oblast, Russia Ilm-Kreis, a region in Germany Science and technology IK (gene), a protein-encoding gene IK code, a classification of resistance to mechanical impacts Internationale Kerze (German for "international candle"), an old photometric unit to measure luminous intensity Inverse kinematics, a branch of mechanics Other uses Ik Onkar, a symbol used in the Sikh religion Ik people of Uganda The Ik, a 1975 play by Colin Higgins and Denis Cannan Imran Khan, Pakistani politician and former cricketer Index Kewensis, a publication maintained by the Royal Botanic Gardens, Kew Indigenous knowledge, traditional knowledge held by indigenous peoples International Karate, a computer game