Editing HEI

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'''HEI''' may refer to:
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== 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: ''{{lang|fr|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)|''Hei'' (album)]], 2015 album by Norwegian duo Marcus & Martinus
* [[Hei (Darker than Black)|Hei (''Darker than Black'')]], protagonist of the 2007 anime
* [[Qi]], in traditional Chinese culture, a principle forming part of any living thing (Cantonese: ''hei'')

==See also==
* [[Hiei (disambiguation)]]

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