JH

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
 * , symbol for Yokohama Line railway service