JX

JX may mean:

* Ĵ, the letter in the Esperanto alphabet
* Roland JX-3P, a MIDI capable synthesizer keyboard which debuted in 1983
* JX (artist) is an early alias of DJ Jake Williams, who is more recently known as Rex the Dog.
* JX (operating system), a Java operating system
* J. X. Williams, a pseudonym used by several different authors during the 1960s for many adult novels