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
- JH, symbol for Yokohama Line railway service