HX

HX may refer to:

* Ĥ, the letter in the Esperanto alphabet
* HX (convoy), a convoy code used during World War II
* HX DOS Extender, a free software product
* Hong Kong Airlines IATA code
* Hummer HX, an upcoming automobile produced by HUMMER
* HX is used as an abbreviation of a hydrogen halide
* The HX postcode area, covering Halifax, Elland, Hebden Bridge and Sowerby Bridge in England.