CD or cd may stand for:

• a compact disc
• a certificate of deposit
• civil defense
• the symbol for the chemical element cadmium (Cd)
• the abbreviated form of the SI unit of light intensity, candela
• an initialism for cash dispenser (at least used in Japan)
• a UNIX and DOS command, see chdir
• an initialism for České dráhy - English: Czech Railways
• a designation of a 1960s Panhard race car designed by Charles Deutsch
• a cluster of differentiation, (e.g. CD4 or CD8 lymphocytes).
• congressional district
• Corps Diplomatique
• the ISO 3166-1 alpha-2 country code for the Democratic Republic of the Congo, and its ccTLD .cd
• circular dichroism
• a crossdresser
• Chalmers Datenforung, the computer club of the Chalmers University of Technology
• the CD LPMud Driver
• drag coefficient
• the Centrums demokraterne , the Centre Democrats in Denmark.

• Looking for CfD instead? Try Wikimedia:Categories for deletion