SUMMARY The activities of the international organizations devoted to the study of population problems have already been examined in three articles published in Population. The present paper deals mainly with those connected with the Third World Population Conference which will be held in 1974. That year has been designated by the United Nations as the World Population Year. The General Secretary of the United Nations has asked all the governments to indicate how they intend to celebrate the World Popu- lotion Year. This question was discussed, in Geneva, by the Population Commission, in November 1971. The Third World Conference will consist of a meeting of delegates sent by the various governments to discuss population policies and to adop...