HDL may refer to one of the following:
- Hardware description language
- High density lipoprotein
- HDL (NDB), call sign of an non-directional beacon at Plankstadt, Germany. In Electronics, a hardware description language or HDL is any language from a class of Computer languages and/or Programming languages for formal High-density lipoproteins ( HDL) is one of the 5 major groups of Lipoproteins ( Chylomicrons, VLDL, IDL, LDL, HDL In Broadcasting and Radio communications a call sign (also known as a callsign or call letters, or abbreviated as a call, or otherwise A Non-directional beacon ( NDB) is a Radio transmitter at a known location used as an aviation or marine Navigational aid Plankstadt is a municipality in the district of Rhein-Neckar-Kreis, in Baden-Württemberg, Germany.
- Les Hurlements d'Léo, an alternative rock band from France. Les Hurlements d'Léo is an alternative rock band from Bordeaux in France
- The Halle du Livre, a library in Nancy, France (often abbreviated HdL with the "d" uncapitalised). A library is a collection of information sources resources and services and the structure in which it is housed it is organized for use and maintained by a public body an institution Nancy (nɑ̃si archaic Nanzig Nanzeg is a city and commune in the Lorraine région of northeastern France
- A German abbreviation of "Hab dich lieb", common in informal written communication, meaning "I love you" among friends rather than among lovers (see I love you). The German language (de ''Deutsch'') is a West Germanic language and one of the world's major languages.
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