'''HLH''' may refer to:
== Biology and medicine ==
* Hemophagocytic lymphohistiocytosis, a blood disorder * Basic helix–loop–helix, a structural motif in proteins * ''Hectopsyllidae'', a family of parasitic fleas
== Places ==
* Haydom Lutheran Hospital, in Manyara Region, Tanzania * Ulanhot Yilelite Airport, in Inner Mongolia, China * Hulan District, in Harbin, China; see List of administrative divisions of Heilongjiang * Merrill (Marriner Wood) Hall, a dorm at Brigham Young University in Provo, Utah, U.S.; see List of Brigham Young University buildings#Helaman Halls
== Other uses == * HLH Orion minicomputer, by High Level Hardware Ltd * Harry Lloyd Hopkins (1890–1946), an American statesman; see George Racey Jordan#Congressional testimony * Hillesheimite, a mineral; see List of mineral symbols#H * Hala Air, an airline based in Sudan; see List of airline codes (H) * Heavy-lift helicopter, a type of military helicopter * Haklau Min, a variety of Min Chinese, by proposed ISO 639-3 code
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