IK or Ik may refer to:

Look up IK, Ik, -ik, ik', or ik- in Wiktionary, the free dictionary.

• IK Investment Partners, a European private equity firm
• Imair Airlines (IATA code IK)
• Iparretarrak, a Basque nationalist organization

• 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

• 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

• 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

• Ik Onkar, a symbol used in the Sikh religion
• Ik people of Uganda
• The Ik, a 1975 play by Colin Higgins and Denis Cannan

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