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