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HHI may refer to:

  • Habitat for Humanity International
  • Hamburg International, a former German airline
  • Harvard Humanitarian Initiative
  • Heinrich Hertz Institute, an organization of the Fraunhofer Society
  • Henry Henderson Institute, an educational establishment in Blantyre, Malawi
  • Herfindahl-Hirschman index, an econometric concept
  • Hildesheim Hauptbahnhof, a train station in Germany
  • Hilton Head Island, South Carolina, United States
  • Hillcrest Heights Institute, in Magalang, Pampanga, Philippines
  • Hoia Hoia language
  • Hopewell Highway Infrastructure
  • Household income
  • Hyundai Heavy Industries
  • Wheeler Army Airfield, in Hawaii