| Acronym | Definition |
|---|
| UCI | University of California, Irvine |
| UCI | Union Cycliste Internationale (International Cycling Union) |
| UCI | United Cinemas International (UK) |
| UCI | Universal Chess Interface (protocol) |
| UCI | Uplink Control Information (wireless communications) |
| UCI | Ultrasonic Contact Impedance (hardness test method) |
| UCI | Uniform Computer Information |
| UCI | Universal Content Interface |
| UCI | Universal Class Installer |
| UCI | Universal Connector Interface |
| UCI | Upper Cook Inlet (Alaska) |
| UCI | Unidad de Cuidados Intensivos |
| UCI | Unit Compliance Inspection (military) |
| UCI | Unlawful Command Influence (military justice) |
| UCI | Urban Coast Institute (Monmouth University; New Jersey) |
| UCI | Unemployment Compensation Insurance |
| UCI | Microcurie (unit of radioactivity) |
| UCI | Unicredito Italiano (Italian banking group) |
| UCI | University Circle Incorporated (Cleveland, Ohio) |
| UCI | Union des Constructeurs Immobiliers (French: Union of Builders) |
| UCI | Utah Correctional Industries |
| UCI | User-Computer Interface |
| UCI | Universal Communications Identifier |
| UCI | Union City, Indiana |
| UCI | Ultimate Creations, Inc. (various organizations) |
| UCI | Under Construction Indefinitely |
| UCI | Unique Client Identifier |
| UCI | Unclassified Controlled Information |
| UCI | Unique Consignment Identifier |
| UCI | United Cycling Institute |
| UCI | Union Cynologique International |
| UCI | Urban Consultants, Inc. |
| UCI | Universal Coolness Index |
| UCI | Updated Coordinating Instructions |
| UCI | Unión Corresponsalía Internacional (Guatemala) |