INH or inh may refer to:
Ingush language, ISO 639 code Inhambane Airport, Mozambique, IATA code INH Isonicotinic acid hydrazide or isoniazid, an antibiotic for treatment of tuberculosis
Historic uses Dutch East Indies, former FIFA country code INH Instituto Nacional de Hidrocarburos (INH, National Hydrocarbons Institute, 1980–1995), Spanish state-owned petroleum management company