HDL

HDL may refer to one of the following:

Science and technology

 * Hardware description language, in computer engineering
 * Handle System identifier (Hdl.handle.net)
 * High-density lipoprotein, complex particles
 * Huntington's disease-like syndromes, a family of genetic neurological diseases

Other uses

 * GE HDL, a diesel engine
 * HDL System, HDL Universal Tactical role-playing game system produced by Tremorworks, LLC
 * Harry Diamond Laboratories, a U.S. Army laboratory
 * Headstone Lane railway station (National Rail station code), London, England
 * Les Hurlements d'Léo, an alternative rock band from France