CD may be:

• a compact disc
• a '''certificate of deposit
• civil defense
• the symbol for the chemical element cadmium (Cd)
• the abbreviated of the SI unit of light intensity, candela
• an initialism for cash dispenser (at least used in Japan)
• a UNIX and MS-DOS command, see chdir
• an initialism for Ceske Drahy -- 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 country code for the Democratic Republic of the Congo, and its ccTLD .cd
• circular dichroism'''

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