| Name: | Organization for Security and Cooperation in Europe (OSCE) |
| Foundation date: | 25 June 1973 - Conference on Security and Cooperation in Europe 1 August 1975 - Helsinki Final Act signed 1 January 1995 - OSCE foundation |
| Headquarters: | Vienna (Austria) |
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OSCE flag |
| 25 June 1973 | Austria,
Belgium,
Bulgaria,
Canada,
Cyprus,
Czechoslovakia (membership dissolved 31 December 1992),
Denmark,
Finland,
France,
Federal Republic of Germany,
German Democratic Republic (since 1990 merged to FRG),
Greece,
Holy See,
Hungary,
Iceland,
Ireland,
Italy,
Liechtenstein,
Luxemburg,
Malta,
Monaco,
Netherlands,
Norway,
Poland,
Portugal,
Rumania,
San Marino,
Soviet Union (since 1991 - Russia),
Spain,
Sweden,
Switzerland,
Turkey,
United Kingdom,
United States,
Yugoslavia (expelled 8 July 1992) |
| 19 June 1991 | Albania |
| 10 September 1991 | Estonia, Latvia, Lithuania |
| 30 January 1992 | |
| 24 March 1992 | Croatia, Georgia, Slovenia |
| 30 April 1992 | Bosnia and Herzegovina |
| 1 January 1993 | Czechia, Slovakia |
| 12 October 1995 | Macedonia |
| 25 April 1996 | Andorra |
| 10 November 2000 | Yugoslavia (since 2003 - Serbia and Montenegro) |
