CB: citizen's band mobile radio communications
CBSS: Council of the Baltic Sea States
CCC: Customs Cooperation Council
CDB: Caribbean Development Bank
CE: Council of Europe
CEI: Central European Initiative
CEMAC: Economic and Monetary Community of Central Africa
CEPGL: Economic Community of the Great Lakes Countries
CERN: European Organization for Nuclear Research
CEPT: Conference Europeanne des Poste et Telecommunications