Ix

IX may refer to:
 * IX, the Roman numeral for the number 9

IX or Ix may also refer to:

Music

 * IX (...And You Will Know Us by the Trail of Dead album)
 * IX (Bulldozer album)
 * IX (Corrosion of Conformity album)
 * IX, used as a logo by the band Ice Nine Kills
 * IX, the first song off of Trivium's album What the Dead Men Say

Literature

 * iX (magazine), a German monthly computer magazine
 * Ix (Dune), a fictional planet in Frank Herbert's Dune
 * Ix (Oz), a fictional country in Queen Zixi of Ix by L. Frank Baum
 * Ix, the central governmental supercomputer in Omikron: The Nomad Soul
 * Ix, the nickname of Ford Prefect from the Hitchhiker's Guide to the Galaxy by Douglas Adams

Other media

 * The IX monogram, a monogram for Christ
 * Ix, the primary antagonist of Sonic Chronicles: The Dark Brotherhood
 * IX, a map in zombies mode (chaos storyline) of Call of Duty Black Ops 4
 * IX, an entity from the video game Destiny 2
 * IX, Aeon of Nihility in Honkai: Star Rail

Other uses

 * IxD, interaction design
 * Internet exchange point
 * Air India Express (IATA airline code IX), budget arm of Air India
 * Noveschi, an oligarchy ruling Siena, Italy during the late Middle Ages
 * Ix, the 14th day in the Tzolk'in calendar
 * Ix Chel, Maya jaguar goddess
 * Ix Ek' Naah, Maya queen
 * defunct Flandre Air (IATA airline code IX)
 * A US Navy hull classification symbol: Unclassified miscellaneous vessel (IX)
 * iX, the short name of iXsystems
 * BMW iX, an electric sport utility vehicle
 * I-X Center or International Exposition Center in Cleveland, Ohio, U.S.