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
 - HDI (Help Desk Institute), a division of UBM Technology Group
 - Highest density interval, a method for choosing a credible interval in Bayesian statistics
 
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