DLH is a three-letter abbreviation which may refer to: Abbreviation for pre-war Deutsche Luft Hansa DLH Group, a Danish timber supply company Domestic long-haired cat IATA code for Duluth International Airport in Duluth, Minnesota Former abbreviation of General Directorate of the Infrastructural Investment in Turkey ICAO designator for Lufthansa, a German airline Station code of the Amtrak Thruway Motorcoach station in Duluth, Minnesota