The Human Development Index is a United Nations measure of well-being in a country.
HDI may also refer to: PSA HDi engine, a diesel automobile engine by Peugeot/Citroën 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-30 connector, an external SCSI connector by Apple HDI-45 connector, a video connector by Apple Heroux-Devtek Inc., a manufacturer of aircraft undercarriages Hdi language of Cameroon and Nigeria HDI-Arena, a sports stadium in Hanover, Germany
See also HD1 (disambiguation)