HEI

Hei or 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

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

Places

• Heilongjiang, a province of China
• Hei District, Chiba, a former administrative unit of Japan
• Hei Glacier, in Antarctica
• Hei River, in China

Other uses

• He (letter), the fifth letter of many Semitic alphabets
• Hei (album), 2015 album by Norwegian duo Marcus & Martinus
• Heide–Büsum Airport, in Schleswig-Holstein, Germany
• Heighington railway station, in England
• Heiltsuk-Oowekyala language, spoken in Canada
• 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
• Qi, an active principle forming part of any living thing (Cantonese: hei)
• Hei, the main character from Darker than Black
• High-efficiency incandescent, a type of incandescent light bulb