TUI AG (Touristik Union International), German tour operator

Tui (bird), a bird endemic to New Zealand

Touch user interface, a computer-pointing technology based upon the sense of touch (haptics)

Text user interface, a retronym coined after the invention of graphical user interfaces, to distinguish them from text-based user interfaces

Tui, Galicia, a town in Galicia, Pontevedra, Spain

Telephone User Interface, a type of Voice User Interface (interaction with computers using voice) applied to telephony technology

Tangible User Interface, a user interface in which a person interacts with digital information through the physical environment

Tui Awards, New Zealand's annual music industry awards

Tui Regio, a region on Saturn's moon Titan

Tu'i (or Tui), a title of nobility in Polynesia and some of Melanesia

Tui Sports, a 1930s New Zealand aircraft

Turaif Domestic Airport (IATA code: TUI), a public airport in Turaif, Saudi Arabia