CDX or CDx may stand for: Cdx, a gene family CDX Format in chemistry software Climate Data Exchange, software Community Development Exchange Companion diagnostic (Cdx) Council of Ten () of the Venetian Republic Cyclodextrins or cycloamyloses, a family of oligosaccharides Sega CD-X, a video game console The Datel CDX cartridge The Numark CDX, a CD turntable The CDX Credit default swap index 410 in Roman numerals An average graded sheet of exterior plywood Centre-right coalition, an alliance of political parties in Italy