UMI may refer to:
- Universal Mobile Interface (UMI)
- Universal Metering Interface (UMI)
- Urban Ministries, Inc. (UMI)
- The former name of ProQuest, a microfilm and electronic archive
- Union Mundial pro Interlingua, an organization related to the international language Interlingua
- The Unione Matematica Italiana, an Italian mathematics society
- Three letter abbreviation for the United States Minor Outlying Islands
- University Microfilms International
- Uganda Management Institute, a government-owned, degree-awarding business education institute in Kampala, Uganda
- Unified Media Interface, a computer interconnect