UIL may mean:
- UIL Holdings Corporation, a natural gas company based in Connecticut, U.S.
 - UNESCO Institute for Lifelong Learning, a United Nations educational centre
 - Unione Italiana del Lavoro, the Italian Labour Union
 - United International Airlines, ICAO designator of a Serbian cargo airline
 - United Irish League, a nationalist political party in Ireland from 1898 through the 1920s
 - University Interscholastic League, the governing body for public school interscholastic activities in the US state of Texas
 - User-in-the-loop, a system theoretic paradigm to change user behavior
 - User Interface Language, an X11 application language used by Motif
 - Uil River, a river of Kazakhstan
 
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