HDN may refer to
Medicine
*
Hemolytic disease of the newborn, an alloimmune illness
*
Hydronephrosis, hydrostatic dilation of the kidney
Places
*
Harlesden station, England, station code
*
Yampa Valley Airport, Colorado, US, IATA code
Other
* ''
Hyperdimension Neptunia'', a video game series
*
Hydrodenitrogenation
Hydrodenitrogenation (HDN) is an industrial process for the removal of nitrogen from petroleum. Organonitrogen compounds, even though they occur at low levels, are undesirable because they cause poisoning of downstream catalysts. Furthermore, up ...
, an industrial chemical process
*
Northern Haida language
Haida (', ', ', ') is the language of the Haida people, spoken in the Haida Gwaii archipelago off the coast of Canada and on Prince of Wales Island in Alaska. An endangered language, Haida currently has 24 native speakers, though revitalizati ...
of North America, ISO 639-3 code
*
Philippine Human Development Network The Human Development Network Foundation Inc. (HDN) is a non-stock, non-profit organization whose mission is to propagate and mainstream the concept of sustainable human development through research and advocacy.
The HDN is a group of development p ...
* Hdn., an abbreviation for the Greek grammarian
Aelius Herodianus
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