Look up hei in Wiktionary, the free dictionary.

HEI may refer to:

• 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

• 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

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

• 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

• 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

• 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)

• Hiei (disambiguation)

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