KI

• Ki (album), a 2009 album by Devin Townsend Project
• Ki, a 1979 album by Kitarō
• "Ki", a song from the album Minecraft – Volume Beta by C418

• Adam Air (2002–2008), an Indonesian airline (IATA code KI)
• Karolinska Institute, Swedish university
• Kativik Ilisarniliriniq, a school district in northern Quebec
• Kenyon Institute, a British research institute in Jerusalem
• Kiwanis International, service club
• Klaksvíkar Ítróttarfelag, a Faroese semi-professional football club
• Konservasi Indonesia, an Indonesian non-governmental conservation foundation

• Ki language, a Southern Bantoid language of Cameroon
• Ki (kana), a Japanese syllabic character
• Ki (cuneiform), a sign in cuneiform writing
• Gikuyu language, ISO 639-1 code:ki

• Ki (Korean surname), a Korean surname
• Ki or Qi (surname)
• Ki or Ji (surname)

• Kangaroo Island, South Australia
• Ki Monastery, in India
• Kiawah Island, South Carolina, United States
• King Island (Tasmania), Australia
• Kings Island, Ohio, United States; an amusement park owned by Six Flags
• Kiribati
  • .ki, the ISO 3166-1 alpha-2 country code top level domain for Kiribati
• Kitchenuhmaykoosib Inninuwug First Nation
• Station code for Kurai Taji railway station, in Indonesia

• Ki (goddess)
• Qi, or ki in Japanese, a vital force according to Chinese culture that forms part of any living thing

Biology and chemistry

• Ti (plant), also called Kī
• K_i, an equilibrium constant for a chemical reaction or process "i":
  • dissociation constant applicable to process, abbreviated as "i".
  • a measure of the binding affinity of a ligand to a biomolecule
• Potassium iodide, chemical formula KI
• Gene knockin or Knock-in, a genetic engineering method
• Ki Database, a database of biochemical information

Computing

• Ki (prefix symbol), the prefix symbol of the binary unit prefix kibi
• Ki, International Electrotechnical Commission standard symbol for number 1024
• K-I algorithm, Kittler and Illingworth iterative algorithm for image segmentation thresholding
• Ki (or K_i), the unique cryptographic key of each cell phone's SIM card

Electronics

• Ki (standard), a wireless power transmission standard for kitched appliances from the Wireless Power Consortium

• Knowledge integration, in epistemology
• Grover C. Winn (1886–1943), nicknamed "Ki", American lawyer and politician
• Gakirah Barnes (died 2014), nicknamed "K.I" or "KI", American gangster
• Kitchener line (KI) of the GO Transit rail network in Ontario, Canada