Cui or CUI may refer to:
People Cui (surname), a Chinese surname Cui Shian (born 1957), governor of Macau César Cui (1835–1918), Russian composer
Education Catholic University of Ireland COMSATS University Islamabad Concordia University Irvine
Science and technology Character-based user interface Copper(I) iodide (CuI) Corrosion under insulation Cubic inch, a unit of volume CUI Devices, an electronic components manufacturer Hamburg Centre for Ultrafast Imaging, a German research institute
Other uses Cui (character), a character in Dragon Ball media Controlled Unclassified Information, in the United States Cuiba language Cui-ui, a fish endemic to Pyramid Lake in northwestern Nevada Cui (or cuy), a Peruvian term for the guinea pig, when used as food
See also Cui bono, "To whose benefit?", a Latin adage used to suggest a hidden motive Choi (Korean version of the Chinese surname Cui)