UX, Ux, or ux may refer to:
Astronomical objects UX Antliae, a post-AGB star in Corona Borealis UX Arietis, a triple star system UX Lyncis, a dim, red-hued star in Lynx UX Tauri, a binary star system
Computing Software LG UX Unix, an operating system family A/UX, by Apple Computer (1988–1995) DG/UX, by Data General (1985–2001) HP-UX, by Hewlett-Packard (1982–)
Other uses in computing Sony Vaio UX Micro PC, a 2006 laptop brand iHub UX Lab, Nairobi, Kenya
Language Ux., legal shorthand for 'wife'; see Et uxor Ux or ux, a digraph substitute for Ŭ or ŭ in Esperanto's X-system ASCII transliteration
Transportation Businesses Air Europa (IATA code: UX) United Express, a brand of United Airlines
Vehicles Lexus UX, a Japanese subcompact SUV LF-UX, a concept preview of the car SM U-10 (Austria-Hungary) (or U-X), the lead boat of the U-10 class of submarines of the Austro-Hungarian Navy
Other uses User experience, a person's behaviors, attitudes, and emotions about using a product, system, or service les UX, an underground organization that improves parts of Paris Uranium-X, historical name for the chemical element protactinium Niigata Television Network 21, a Japanese commercial broadcaster