JH may refer to: Jh (digraph), in written language JH (hash function), in cryptography Japan Highway Public Corporation Jharkhand, India (ISO 3166: JH) Juvenile hormone Fuji Dream Airlines (since 2008, IATA code JH), a Japanese airline Harlequin Air (1997-2005, IATA code JH), a former Japanese airline Nordeste Linhas Aéreas Regionais (1976-1995, IATA code JH), a former Brazilian airline