CLK may refer to:
Transport Cadillac and Lake City Railway Changle railway station (Shandong), China Clinton Regional Airport, Oklahoma, United States Clock House railway station, London, England Hong Kong International Airport Mercedes-Benz CLK-Class
Other uses Public Schools of Calumet-Laurium-Keweenaw (ČLK), a Czech doctors' organization; see David Rath Clackmannanshire, a historic county in Scotland Confederation of Labour of Kazakhstan Idu Mishmi language Hunter-Killer cruiser; see List of cruisers of the United States Navy