Ix or IX may refer to:

• The Roman numeral representing the number nine — literally one(I) less than ten (X).
  • (There are also separate Unicode characters for this number, 0x2168 "Ⅸ" and 0x2178 "ⅸ").
• Internet Exchange, or Internet Exchange Point.
• iX: A German monthly computer magazine.
• The IX multilevel-secure Unix operating system
• Unclassified Miscellaneous Units: US Navy hull classification symbol.
• The Maya jaguar god supporting the west portion of the sky. See Maya mythology.
• The central governmental supercomputer in the videogame Omikron - The Nomad Soul.
• A fictional planet in Frank Herbert's novel Dune. See Ix (planet).
• A fictional country in the book Queen Zixi of Ix by L. Frank Baum, neighboring on the Land of Oz.
• A nickname for Ford Prefect — a character from The Hitchhiker's Guide to the Galaxy — that translates into "boy who is not able satisfactorily to explain what a Hrung is, nor why it should choose to collapse on Betelgeuse Seven".
• A slow, hypnotic and crushing Doom Metal band from Scotland.

IX | IX | Ix | IX | Ix