UI, Ui, or ui may refer to:
Arts and entertainment
- Ui (band), an American post-rock band
- UI (film), an Indian Kannada-language film set for release in 2024
- Upin & Ipin, in which the abbrebiation 'UI' shows in the episode Selamatkan Neo Santara
- Ui Hirasawa, a character from the manga series K-On!
- Ui Miyazaki (born 1981), Japanese voice actress
- Ui Shigure, Japanese illustrator
- Arturo Ui, a fictional character from The Resistible Rise of Arturo Ui by Bertolt Brecht
- Youichi Ui (born 1972), Japanese motorcycle road racer
- Manami Ui (born 1986), Japanese model
Businesses and organizations
Universities
- University of Ibadan, Nigeria
- University of Iceland
- University of Idaho, US
- University of Illinois, US
- University of Iloilo, Philippinesee
- University of Indonesia
- University of Innsbruck, Austria
- University of Iowa, US
- Universities Ireland, Northern Ireland
- University of Isfahan, Iran
Other businesses and organizations
- The United Illuminating Company, a regional electric distribution company in the northeastern US
- Eurocypria Airlines (IATA airline designator UI)
- Ubiquiti, an American technology company
- Unix International, an open-standard association
Science, technology, and mathematics
Computing
- Unit interval (data transmission), also pulse time or signal duration time
- User interface, between human and machine
Other uses in science, technology, and mathematics
- International unit, typically used for medication dose
- Unit injector for diesel engines
- Urinary incontinence
Other uses
- Ui (digraph), used in some writing systems
- Unauthorised information; see Glossary of contract bridge terms#unauth
- Unemployment insurance
- United Ireland, a proposed state
- Universitas Indonesia railway station at the University of Indonesia
See also
- U1 (disambiguation)
- μi, the initial magnetic permeability of a material
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