HDI (disambiguation)

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