HGD

HGD, or hgd, may refer to:

Medical science

 * Hymenoptera Genome Database, a resource supporting the genomics of Hymenoptera
 * Homogentisate 1,2-dioxygenase, an enzyme which catalyzes the conversion of homogentisate to 4-maleylacetoacetate
 * 2-hydroxymethylglutarate dehydrogenase (HgD), an enzyme belonging to the family of oxidoreductases

Transport

 * HGD, the Amtrak code for Huntingdon (Amtrak station), Pennsylvania, United States
 * HGD, the IATA code for Hughenden Airport, Queensland, Australia
 * HGD, the ICAO code for Hangard Airlines, a defunct Mongolian airline
 * HGD, the National Rail code for Hungerford railway station in the county of Berkshire, UK