Wei

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

 * Wei (given name), different variations of Chinese given names
 * Wei (surname), various Chinese surnames (魏, 衛, 尉, 蔿, 韋)
 * Wei Wei (disambiguation)

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, a star otherwise known as Epsilon Scorpii
 * Wei Empire, a fictional state and planetary romance series of Yulia Latynina