International Organizations and Groups | Aim - Objective |
| Central European Initiative (CEI) | to form an economic and political cooperation group for the region between the Adriatic and the Baltic Seas |
| centrally planned economies | centrally planned economies |
| Collective Security Treaty Organization (CSTO) | to coordinate military and political cooperation, to develop multilateral structures and mechanisms of cooperation for ensuring national security of the member states |
| Colombo Plan (CP) | to promote economic and social development in Asia and the Pacific |
| Common Market for Eastern and Southern Africa (COMESA) | recognizing, promoting and protecting fundamental human rights, commitment to the principles of liberty and rule of law, maintaining peace and stability through the promotion and strengthening of good neighborliness, commitment to peaceful settlement of disputes among member states |
| Commonwealth (C) | to foster multinational cooperation and assistance, as a voluntary association that evolved from the British Empire |
| Commonwealth of Independent States (CIS) | to coordinate intercommonwealth relations and to provide a mechanism for the orderly dissolution of the USSR |
| Communist countries | Communist countries |
| Comuinidade dos Paises de Lingua Portuguesa (CPLP) | to establish a forum for friendship among Portuguese-speaking nations where Portuguese is an official language |
| Coordinating Committee on Export Controls (COCOM) | Coordinating Committee on Export Controls (COCOM) |
| Council for Mutual Economic Assistance (CEMA) | Council for Mutual Economic Assistance (CEMA) |
| Council of Arab Economic Unity (CAEU) | to promote economic integration among Arab nations |
| Council of Europe (CE) | to promote increased unity and quality of life in Europe |
| Council of the Baltic Sea States (CBSS) | to promote cooperation among the Baltic Sea states in the areas of aid to new democratic institutions, economic development, humanitarian aid, energy and the environment, cultural programs and education, and transportation and communication |
| Council of the Entente (Entente) | to promote economic, social, and political coordination |
| countries in transition | countries in transition |
| Customs Cooperation Council (CCC) | Customs Cooperation Council (CCC) |