UDI may refer to:

Organisations Independent Democratic Union (Unión Demócrata Independiente), a political party in Chile Union of Democrats and Independents, a political party in France United Defense Industries, a supplier of land warfare systems, now part of BAE Systems Land and Armaments United Diving Instructors, a diver training organization

Technology Uniform Driver Interface, a project to develop portable device drivers Unified Display Interface, digital video interface specification based on DVI Universal Disk Image, a disk image format Unique Device Identification, a system that is intended to assign a unique identifier - the Unique Device Identifier - to medical devices within the United States, Europe, China, South Korea, Saudi Arabia and Taiwan Unrestricted Digital Information, a type of Circuit Switched Data Bearer Capability service commonly used with GSM cellular networks

Other uses Unilateral declaration of independence, an assertion of the independence of an aspiring state or states Rhodesia's Unilateral Declaration of Independence, in November 1965 Mexican unidad de inversión, Mexican currency funds unit Universal design for instruction, an educational framework

See also Udi (disambiguation)