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" (Kanye West song), an alternative name for the song to bypass social media censorship
  • HH, the production code for the 1967 Doctor Who serial The Moonbase
  • Higglytown Heroes, an American animated series
  • Horrible Histories, media franchise
  • Hazbin Hotel, an Amazon Prime series
  • HH (Lionel Loueke album)

People

  • Hakainde Hichilema, Zambian politician

Terms and phrases

  • hh (digraph), in several languages
  • 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
  • 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, United States

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