UI, Ui, or ui may refer to:

Arts and entertainment

  • Ui (band), an American post-rock band
  • UI (film), an Indian Kannada-language film released 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, Philippines
  • 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

  • Unité internationale, French for 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)
  • μ<sub>i</sub>, the initial magnetic permeability of a material