KI
- Communist Initiative, Marxist-Leninist organisation in Austria
- KI, potassium iodide
- KI, airline Adam Air
- KI, nation Kiribati
- Gene knockin or Knock-in, genetic engineering method
- KI (Soviet intelligence service), integrated Soviet foreign intelligence service in 1946-48
- KÍ Klaksvík, football club
- Kangaroo Island, Australia
- Karolinska Institutet, Swedish university
- King's Indian, a common chess opening
- Kings Island, Ohio, United States, amusement park owned by Cedar Fair Entertainment Company
- Killer Instinct, video game
- Kid Icarus, video game
- Kambakkht Ishq, 2009 Hindi language film
- Kids Incorporated, TV series
- KI, a D'ni communication device used in the game Uru: Ages Beyond Myst
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