CLK may refer to: Cadillac and Lake City Railway Public Schools of Calumet-Laurium-Keweenaw Calumet High School (Calumet, Michigan) (ČLK), a Czech doctors' organization; see David Rath Chek Lap Kok, the island where the newer Hong Kong International Airport is located; the airport is also known as Chep Lap Kok airport Clackmannanshire, historic county in Scotland (Chapman code: CLK) Clinton Regional Airport, Oklahoma, USA (IATA code: CLK) Clock House railway station, London, England (National Rail station code CLK) Confederation of Labour of Kazakhstan ISO 639:clk or Idu Mishmi language, spoken by the Mishmi people Mercedes-Benz CLK-Class A CLK (clock) pin in an electric circuit; see Intel 8253 See also CLK-1 (disambiguation) CLK2, a human gene CLK3 (disambiguation)