CD (disambiguation)

A CD or compact disc is a thin plastic silvery disc for audio recordings.

CD, C/D, Cd or cd may also refer to:

• CD-ROM, the same technology used for computer data
• Certificate of deposit, bank account in the United States with a fixed maturity date

In science and technology:

• .cd, the Internet domain of the Democratic Republic of the Congo
• Cadmium, the chemical element; abbreviated Cd
• Candela, a unit of light intensity; abbreviated cd
• Circular dichroism, a form of spectroscopy
• Drag coefficient, a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment; abbreviated C_d
• Cluster of differentiation in cell surface markers
• Cordoba Durchmusterung, a star catalogue of the southern sky; stars are listed in the catalog by numbers prefixed with "CD"
• Type-cD galaxy, a galaxy morphology classification
• cd (command), a command line command to change the current working directory in operating systems
• -CD, the North American call sign suffix for Class A low-power television stations operating with digital signals
• Chart datum, in nautical charts
• Cluster of differentiation, a protocol used for the identification and investigation of cell surface molecules present on white blood cells; abbreviated CD
• Conservation Dependent, an IUCN category assigned to species or lower taxa which were dependent on conservation efforts to prevent the taxon becoming threatened with extinction; abbreviated LR/cd

In politics:

• Canadian Forces Decoration, a Canadian award bestowed upon members of the Canadian Forces who have completed twelve years of military service; abbreviated CD
• Damascus Document, a text found among the Dead Sea Scrolls
• Centre Democrats (Denmark), a former Danish political party
• Centre Democrats (Netherlands), a former political party of the Netherlands
• Community of Democracies, an intergovernmental organization of democracies and democratizing countries with a stated commitment to strengthening and deepening democratic norms and practices worldwide
• Conference on Disarmament, organized by the United Nations
• Congressional district, forum established by the international community to negotiate multilateral arms control and disarmament agreements

Other uses:

• Geely CD, a coupe automobile from Chinese manufacturer, Geely Automobile
• České Dráhy, the main railway operator of the Czech Republic; abbreviated ČD
• "CD", a song by the British progressive rock band T2
• Companion dog title, a title offered by the American Kennel Club for dog obedience; abbreviated CD
• Certified Drafter, a professional designation for mechanical drafting by American Design Drafting Association; abbreviated CD
• The Commander rank in the Jamaican Order of Distinction; abbreviated CD