The Council for Mutual Economic Assistance (Russian: Совет экономической взаимопомощи, Sovet ekonomicheskoy vsaymopomoshchi, СЭВ, SEV, English abbreviation COMECON, CMEA, or CAME), 1949–1991, was an economic organization under the organization of Soviet Union comprising the countries of the Eastern Bloc along with a number of socialist states elsewhere in the world. The Comecon was the Eastern Bloc's reply to the formation of the Organization for European Economic Co-operation in western Europe.

The descriptive term was often applied to all multilateral activities involving members of the organization, rather than being restricted to the direct functions of Comecon and its organs. This usage was sometimes extended as well to bilateral relations among members, because in the system of socialist international economic relations, multilateral accords—typically of a general nature—tended to be implemented through a set of more detailed, bilateral agreements.

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1950:

1962: