HH may refer to:
Organizations HH Electronics, a British amplifier manufacturer Hyper Hippo Entertainment, a Canadian video game company 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
Science, technology and mathematics 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 Hereditary haemochromatosis Herbig–Haro object, in astronomy Hitchhiker Program, a NASA program established in 1984 Hochschild homology Hodgkin–Huxley model, an electrical model of neurons Microsoft Compiled HTML Help (hh.exe)
Transportation HH (Court Street Shuttle), on the New York City Subway 1936–1946 HH (Rockaway Shuttle), on the New York City Subway 1962–1972 HH Ferry route between Helsingborg, Sweden, and Helsingør, Denmark HH Tunnel, a proposed series of tunnels between Helsingborg and Helsingør
Entertainment "Heil Hitler" (song), a 2025 single by Kanye West The Moonbase, a 1967 Doctor Who serial (production code "HH") Higglytown Heroes, an American animated series Horrible Histories, media franchise Hazbin Hotel, an animated television series HH (Lionel Loueke album)
People Hakainde Hichilema, Zambian politician Howard Hughes, American tycoon and film producer
Terms and phrases
hh (digraph), in several languages "hands high" when referring to the height of a horse, abbreviated "hh" Hand-Held, a term in film production among camera staff 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
Places
Hamburg, Germany (ISO 3166-2 code DE-HH) and HH ("Hansestadt Hamburg"), vehicle licence plate prefix Hilton Head Island, South Carolina, an island off the coast of South Carolina, US
Other uses HH, a brassiere cup size Habbo, online community formerly known as Habbo Hotel Happy Hour, a period of time (not necessarily one hour) when bars and restaurants offer discounts on food and/or drinks HH, the name for the former mascot of the electronics/appliances store H. H. Gregg