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HDI may refer to:

  • Human Development Index, a United Nations measure of well-being in a country
  • PSA HDi engine, a diesel automobile engine by Peugeot/Citro├źn
  • Hexamethylene diisocyanate, an organic compound used to make polymers such as polyurethane
  • HDi Interactive Format (formerly iHD), a trademark for Microsoft's implementation of advanced interactivity for HD DVD
  • Histone deacetylase inhibitor, compounds used in psychiatry and neurology, and with anticancer potential
  • HDI-45 connector, a video connector by Apple
  • Heroux-Devtek Inc., a manufacturer of aircraft undercarriages
  • Help Desk Institute, a professional organization for those working in the IT Service Management industry.
  • High Density Interconnects, technology for complex electronic circuit designs in small form factor
  • Hdi, an Afro-Asiatic language
HDi (interactivity)

HDi (formerly iHD) is Microsoft's implementation of the Advanced Content interactivity layer in HD DVD. It is used in the Xbox 360 HD DVD add-on as well as stand-alone HD DVD players.