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
• The Email-Domain for employees of Lufthansa.
• Station code of the Amtrak Thruway station in Duluth, Minnesota

This disambiguation page lists articles associated with the title DLH.
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• DLH, American data-platform abbreviation which may refer to: deductive lake house