Yi

Yi or YI may refer to:

Philosophic principle

Yi (philosophy) (义; 義, righteousness, justice) among the Three Fundamental Bonds and Five Constant Virtues

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

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 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

Yi (Chinese surname), romanization of several Chinese surnames, for example:
- Yi Jianlian (born 1984), Chinese basketball player
- Yi Yuanji (1000–1064), 10th-century Chinese painter
- Yi Siling (born 1989), Chinese shooter, the first athlete to win a gold medal at the London 2012 Olympic Games
Yi (Korean surname)
, including
- House of Yi, household of Joseon and the Korean Empire
- Yi Sun-sin (1545–1598), Korean admiral

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 bank Bon Iver