KIR, Kir or kir may refer to:
Biology Inward-rectifier potassium channel Kir Killer-cell immunoglobulin-like receptor, a receptor protein expressed on the surface of natural killer cells and some T-cells
Bodies of water Kir (river), in northern Albania
Kir Lake, near Dijon, France
People Kir Fard, Armenian nobleman of the 12th–13th centuries Kir Nesis (1934–2003), Russian biologist Kir Bulychev, Russian writer Félix Kir (1876–1968), priest in the French Resistance Kir, a character in Detective Conan
Places Republic of Kiribati in the central Pacific (ISO code: KIR) Kir of Moab, biblical stronghold Land of Kir, biblical location
Transport Katihar Junction railway station, Bihar; station code KIR Kerry Airport, Ireland (IATA code: KIR) Kirkby railway station, Merseyside, England; National Rail station code KIR
Other Kir (cocktail), alcoholic beverage Kyrgyz language (ISO code: kir) Krajowa Izba Rozliczeniowa, an automated clearing house in Poland
See also Kirs (disambiguation) Kyr