NHD may refer to: National History Day, US National Hydrography Dataset, US Networked Help Desk New Hacker's Dictionary, of computer slang Noordhollands Dagblad, a Dutch newspaper Al Minhad Air Base, United Arab Emirates, IATA code Nunhead railway station, London, England, station code nHD, a graphic-display resolution of 640x360 pixels Ava Guarani language of Paraguay, Brazil, and Argentina, ISO 639-3 code