UCI
UCI most commonly refers to:
- University of California, Irvine, a public university in Irvine, California, United States
 - Union Cycliste Internationale, the world governing body for the sport of cycling
 
UCI may also refer to:
- Uganda Cancer Institute, a cancer treatment and research institution in Kampala, Uganda
 - Unified Configuration Interface, a set of scripts to unify and simplify the configuration the OpenWrt operating system
 - Union Correctional Institution, Florida, United States
 - Unione Cinematografica Italiana, an Italian film company of the silent era
 - Unit Compliance Inspection, a United States Air Force inspection
 - UCI Cinemas (United Cinemas International), cinema company in Brazil, Germany, Italy and Portugal
 - Universal Chess Interface, a communications protocol for chess game software
 - Univision Communications Inc., the former name of the American subsidiary of media company TelevisaUnivision
 - Unlawful command influence, a term in American military law
 - Universal Content Identifier, South Korean content identification system