IY

IY may refer to:

• Imperial Yeomanry, a British cavalry regiments (1899–1908)
• InuYasha, a long-running manga and anime series by Rumiko Takahashi
• Saudi–Iraqi neutral zone, FIPS 10-4 digram; obsolete since 1993—although divided by treaty in 1981, this was never filed with the United Nations or any agency outside of the interested parties
• Ito-Yokado, a Japanese General Merchandise Store, which is a member of IY-Group
• Yemenia, IATA airline designator
• IY (band), an American folk-rock band based in Ithaca, New York
• Generation iY, the demographic cohort following Generation X, specifically referring to those born after 1990
• Invincible Youth, a South Korean variety show featuring 7 girls from top K-Pop idol groups where they experience how it is to live and survive in the rural Korea outdoors.