HH

HH may refer to:

Organizations

HH Electronics, a British amplifier manufacturer
Happy Hippie Foundation, a non-profit organization founded by Miley Cyrus
Hartmann House Preparatory School, an independent preparatory school in Harare, Zimbabwe
Heirs Holdings, a Nigerian conglomerate with diversified interests
Helly Hansen, a Norwegian brand specializing in clothing and gear for oceans and mountains
Heywood Hill, a bookshop in London

Hh, a signalling molecule in Drosophila named for the Hedgehog signaling pathway
hh blood group, a rare blood type
Henderson–Hasselbalch equation, in biology and chemistry
Herbig–Haro object, in astronomy
Hitchhiker Program, a NASA program established in 1984
Hodgkin–Huxley model, an electrical model of neurons
Microsoft Compiled HTML Help (hh.exe)
Hereditary haemochromatosis

hh (digraph), in several languages
HH, a brassiere cup size
hh, an abbreviation for "hands high" when referring to the height of a horse
HH, short for Hand-Held, a term in film production among camera staff
HH, the production code for the 1967 Doctor Who serial The Moonbase
Habbo, online community formerly known as Habbo Hotel
Hakainde Hichilema, Zambian politician
Hamburg, Germany (ISO 3166-2 code DE-HH) and HH ("Hansestadt Hamburg"), vehicle licence plate prefix
Happy Hour, a period of time (not necessarily one hour) when bars and restaurants offer discounts on food and/or drinks
Hilton Head Island, South Carolina, an island off the coast of South Carolina
Heath Hitler, White supremacist
Heil Hitler, a chant prevalent in Nazi Germany and neo-Nazi groups
His Highness, or Her Highness, a formal address
His Holiness, or Her Holiness, a formal address
Horrible Histories, media franchise
Hulk Hogan, American professional wrestler
Herbert Huncke, American writer
HH, the name for the former mascot of the electronics/appliances store H. H. Gregg