Wei or WEI may refer to:
States
- Wey (state) (衛, 1040–209 BC), Wèi in pinyin, but spelled Wey to distinguish from the bigger Wèi of the Warring States
- Wei (state) (魏, 403–225 BC), one of the seven major states of the Warring States period
- Cao Wei (曹魏, 220–266), ruled North China during the Three Kingdoms period
- Ran Wei (冉魏, 350–352), short-lived Sixteen Kingdoms period state
- Northern Wei (北魏, 386–535), ruled North China during the Southern and Northern Dynasties, later split into:
:*Western Wei (西魏, 535–557)
:*Eastern Wei (東魏, 534–550)
- Zhai Wei (翟魏, 388–392), state of Dingling/Gaoche ethnicity in China
Places
- Wei River, a main tributary of the Yellow River
- Wei County, Handan (魏县), Hebei, China
- Wei County, Xingtai (威县), Hebei, China
People
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- Wei (given name), different variations of Chinese given names
- Wei (surname), various Chinese surnames (魏, 衛, 尉, 蔿, 韋)
- Wei Wei (disambiguation)
Astronomy
- One of three Chinese constellations:
- Wěi (), meaning Tail
- Wēi (), meaning Rooftop
- Wèi (), meaning Stomach
- Wèi (), the Chinese name for the star Delta Herculis
- Wei, a name sometimes used for Epsilon Scorpii, after the Tail constellation
Other uses
- WEi, a South Korean boy group
- Wei (rank), a company-grade officer in Chinese armed forces
- Wei (value token), a subunit of the Ether value token on the Ethereum blockchain
- Wau Ecology Institute, Wau, Papua New Guinea
- Web Environment Integrity, a Web API proposed by Google
- Windows Experience Index (WEI) score, a measure of the user-perceived performance of a computer running Microsoft Windows
- Weipa Airport (IATA code: WEI), Weipa, Queensland, Australia
- Wei Empire, a fictional state and planetary romance series of Yulia Latynina
See also
- Way (disambiguation)
- Wee (disambiguation)
- Wey (disambiguation)
- Whey (disambiguation)