The Conference on Security and Co-operation in Europe, which opened at Helsinki on 3 July 1973 and continued at Geneva from 18 September 1973 to 21 July 1975, was concluded at Helsinki on 1 August 1975 by the High Representatives of Austria, Belgium, Bulgaria, Canada, Cyprus, Czechoslovakia, Denmark, Finland, France, the German Democratic Republic, the Federal Republic of Germany, Greece, the Holy See, Hungary, Iceland, Ireland, Italy, Liechtenstein, Luxembourg, Malta, Monaco, the Netherlands, Norway, Poland, Portugal, Romania, San Marino, Spain, Sweden, Switzerland, Turkey, the Union of Soviet Socialist Republics, the United Kingdom, the United States of America and Yugoslavia.
During the opening and closing stages of the Conference the participants were addressed by the Secretary-General of the United Nations as their guest of honour. The Director-General of UNESCO and the Executive Secretary of the United Nations Economic Commission for Europe addressed the Conference during its second stage.
During the meetings of the second stage of the Conference, contributions were received, and statements heard, from the following non-participating Mediterranean States on various agenda items: the Democratic and Popular Republic of Algeria, the Arab Republic of Egypt, Israel, the Kingdom of Morocco, the Syrian Arab Republic, and Tunisia.