HEI

HEI may refer to:

Companies and organizations

 * HEI Hospitality, an American hotel owner and operator
 * Hawaiian Electric Industries, the largest supplier of electricity in the state of Hawaii
 * Health Effects Institute, a non-profit focused on the health effects of air pollution
 * HEICO, HEI is the stock symbol for HEICO Corporation

In education

 * Higher education institution
 * Graduate Institute of International and Development Studies (French: Institut universitaire de hautes études internationales et du développement), in Geneva, Switzerland
 * Hautes études d'ingénieur, an engineering school in Lille, France

In language

 * He (letter), the fifth letter of many Semitic alphabets
 * Heiltsuk-Oowekyala language, spoken in Canada

Places

 * Heilongjiang, a province of China
 * Hei District, Chiba, a former administrative unit of Japan
 * Hei Glacier, in Antarctica
 * Hei River, in China
 * Heide–Büsum Airport, in Schleswig-Holstein, Germany
 * Heighington railway station, in England

In science and technology

 * Healthy Eating Index, a measure of diet quality
 * High-efficiency incandescent, a type of incandescent light bulb
 * High energy ignition, an automotive ignition system
 * High explosive incendiary, a type of ammunition
 * Hot-carrier injection, a principle in the function of solid-state electronic devices
 * Human-environment interaction, or Environmental sociology

Other uses

 * Hei (album), 2015 album by Norwegian duo Marcus & Martinus
 * Hei (Darker than Black), protagonist of the 2007 anime
 * Qi, in traditional Chinese culture, a principle forming part of any living thing (Cantonese: hei)