CLK

CLK may refer to:


 * Cadillac and Lake City Railway
 * Public Schools of Calumet-Laurium-Keweenaw
 * Calumet High School (Calumet, Michigan)
 * Česká lékařská komora (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
 * Hong Kong International 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
 * A US Navy hull classification symbol: Hunter-killer cruiser (CLK)