Yi
Yi or YI may refer to:
Philosophic principle
- Yi (philosophy) (义; 義, righteousness, justice) among the Three Fundamental Bonds and Five Constant Virtues
 
Ethnic groups
- Dongyi, the Eastern Yi, or Tung-yi (Chinese: 夷, Yí), ancient peoples who lived east of the Zhongguo in ancient China
 - Yi people (Chinese: 彝, Yí; Vietnamese: Lô Lô), an ethnic group in modern China, Vietnam, and Thailand
 
Language
- Yi (Cyrillic), the letter of the Ukrainian alphabet written "Ї" and "ї"
 - Yi language or the Nuosu language spoken by the Yi people of China
 - Yi script, either of two scripts used to write the Yi languages
 - Yiddish (ISO 639-1 language code: yi), the historical language of the Ashkenazi Jews
 - Yi, an obsolete Japanese kana
 
Mythology and religion
- Yi the Archer or Houyi, a heroic archer and hunter in Chinese mythology
 - Yi (husbandman), also known as Boyi or Bo Yi, a heroic user of fire and government minister in Chinese mythology
 
People
Surname
- Yi (surname 易)
 - Yi (surname 伊)
 - Yi (Korean surname) (李,이), including 
- House of Yi, household of Joseon and the Korean Empire
 - Yi Sun-sin (1545–1598), Korean admiral
 
 
Given name
- Lu Yi (disambiguation), several persons
 - Wu Yi (politician) (born 1938), Vice Premier of China
 
 
Places
- Yi County (disambiguation), two counties in China
 - Yí River, a river in Uruguay
 - Yi River (Henan), a river in China
 - Serbia and Montenegro (FIPS country code: YI), a country in Southeast Europe
 
Other uses
- Yi (dinosaur)
 - Yi (drinkware) (彝), former name for the zun, a traditional bronze drinkware of ancient China
 - Yi (prefix symbol), the prefix symbol of the binary unit prefix yobi, representing 280, the equivalent of the decimal prefix yotta- (Y)
 - Yi (simplified Chinese: 亿; traditional Chinese: 億), an East Asian counting unit meaning 100,000,000
 - Yi (vessel) (匜), a different kind of bronze vessel used in traditional rituals in ancient China
 - YI Technology, a Chinese company that manufactures cameras and computer vision technologies
 - I Ching, or Yijing, ancient Chinese text
 - "Yi" and "iMi", songs by American indie folk band Bon Iver