KOI

KOI may refer to:


 * the IATA airport code for Kirkwall Airport
 * the Indonesian abbreviation of Komite Olimpiade Indonesia for Indonesian Olympic Committee
 * the KOI character encodings for Cyrillic script
 * the KOI-18 cryptographic key fill device used by the U.S. government
 * a Kepler Object of Interest
 * language code for Komi-Permyak language
 * Potassium hypoiodite