MUX, Mux, or mux can refer to
- mux (windowing system), a computer windowing system
- MUX, IATA code for Multan International Airport, Pakistan
- MUX clamp, a tool used in deep sea drilling operations
- MUX (The Hardy Boys), a fictional company in The Hardy Boys book series
- MUX, an abbreviation for multiplexer in circuit design
- Mux, another name for Multiplex (TV)
- Multi-User eXperience, a computer gaming term (see: MU*)
- Marginal rate of substitution variable for the Marginal Utility of good x (MUx)
- Mux Mool, American electronic musician, DJ, and producer