HPI

HPI can refer to:

In technology:
* Hardware Platform Interface, a technical specification defined by the Service Availability Forum
* Host Port Interface, a parallel data port on a computer processor which allows another (host) processor to access its memory space
* High Pressure Injection, which can refer to:
** a technology to inject diesel fuel into the cylinder
** a safety system in nuclear reactors which involves forcing large amounts of cold water into the reactor core
* .HPI, one of the compression formats used by the 1997 RTS Total Annihilation

In medicine:
*Heinrich Pette Institute, an institute for basic research in virology and immunology, based in Hamburg, Germany
*Human probiotic infusion, a treatment, targeting the intestines
*High probability instruction, a behaviorist therapy based on positive reinforcement
*History of the present illness
* Human Performance Improvement

In other uses:
*Happy Planet Index, an index of human well-being and environmental impact
*Hasso Plattner Institute, a private funded college at Potsdam, Germany
*Historic Places Initiative, Canadian heritage program
*Hobby Products International, a manufacturer of radio control vehicles
*House Price Index, a measure of property values within a United States metropolitan area or postal code
*Human Poverty Index, a United Nations measure of the amount of poverty in various countries.
*Hydrocarbon Processing Industry, Hydrocarbon Process(ing) Industry
*Huron Potawatomi, Inc., the business division of the Nottawaseppi Huron Band of Potawatomi