CCIX

CCIX may refer to:


 * The Roman number notation for 209
 * Cache coherent interconnect for accelerators, a consortium dealing with connectivity and communications issues in computer technology
 * CCIX, a historic Association of American Railroads reporting mark for Stauffer Chemical Company, now Cleveland-Cliffs Iron Ore Co.
 * UA-CCIX, the codename for the Kilgore cyborgs in the fighting video game Killer Instinct