संयुक्त राष्ट्रसंघाची स्थापना १९४५ साली करण्यात आली व मूळ सदस्य राष्ट्रांची संख्या ५१ इतकी होती.[२] ह्यांपैकी चेकोस्लोव्हाकिया व युगोस्लाव्हिया ह्या देशांव्यतिरिक्त इतर सर्व देश आजही सदस्य आहेत. ह्या दोन देशांचे विघटन होऊन तयार झालेल्या सर्व देशांना संयुक्त राष्ट्रसंघात वेगळा प्रवेश देण्यात आला. सोव्हिएत संघाच्या विघटनानंतर रशियाने ती जागा घेतली.
खालील यादीत संयुक्त राष्ट्रसंघाचे सर्व विद्यमान सदस्य दिले आहेत. (मूळ सदस्य निळ्या पार्श्वभूमीवर दाखवले आहेत).[३]
^Benin: Name was changed from Dahomey on 1 December 1975.
^Bolivia (Plurinational State of): Previously referred to as Bolivia.
^Burkina Faso: Name was changed from Upper Volta on 6 August 1984.
^Cambodia: Name was changed to the Khmer Republic on 7 October 1970, and back to Cambodia on 30 April 1975. Name was changed again to Democratic Kampuchea on 6 April 1976, and back to Cambodia on 3 February 1990.
^Cameroon: Previously referred to as Cameroun (before merging with Southern Cameroons in 1961). By a letter of 4 January 1974, the Secretary-General was informed that Cameroon had changed its name to the United Republic of Cameroon. Name was changed back to Cameroon on 4 February 1984.
^Central African Republic: By a letter of 20 December 1976, the Central African Republic advised that it had changed its name to the Central African Empire. Name was changed back to the Central African Republic on 20 September 1979.
^Congo: Previously referred to as Congo (Brazzaville) (to differentiate it from Congo (Leopoldville)) and the People's Republic of the Congo. Name was changed to Congo on 15 November 1971 (after the Democratic Republic of the Congo changed its name to Zaire). Also referred to as Congo (Republic of the).
^Côte d'Ivoire: Previously referred to as Ivory Coast. On 6 November 1985, Côte d’lvoire requested that its name no longer be translated into different languages; this became fully effective on 1 January 1986.
^Democratic Republic of the Congo: Previously referred to as Congo (Leopoldville) (to differentiate it from Congo (Brazzaville)). Name was changed from the Democratic Republic of the Congo to Zaire on 27 October 1971, and back to the Democratic Republic of the Congo on 17 May 1997.
^Iran (Islamic Republic of): Previously referred to as Iran. By a communication of 5 March 1981, Iran informed the Secretary-General that it should be referred to by its complete name of the Islamic Republic of Iran.
^Kazakhstan: Spelling was changed from साचा:Sic on 20 June 1997.
^Lao People's Democratic Republic: Name was changed from Laos on 2 December 1975.
^Libyan Arab Jamahiriya: Previously referred to as Libya and the Libyan Arab Republic. By notes verbales of 1 and 21 April 1977, the Libyan Arab Republic advised that it had changed its name to the Libyan Arab Jamahiriya.
^Madagascar: Previously referred to as the Malagasy Republic.
^Malaysia: Name was changed from the Federation of Malaya on 16 September 1963, after the admission of Singapore, Sabah (formerly North Borneo), and Sarawak to the federation. Singapore became an independent state on 9 August 1965 and a UN member on 21 September 1965.
^Maldives: Previously referred to as the Maldive Islands.
^Myanmar: Name was changed from Burma on 18 June 1989.
^Philippines: Previously referred to as the Philippine Commonwealth (before becoming a republic in 1946) and as the Philippine Republic.
^Republic of Moldova: Previously referred to as Moldova.
^Saint Kitts and Nevis: Name was changed officially from Saint Christopher and Nevis on 26 November 1986; the UN, however, continued to use the former name throughout the year.
^South Africa: Previously referred to as the Union of South Africa (before becoming a republic in 1961).
^Sri Lanka: Name was changed from Ceylon on 22 May 1972.
^Suriname: Name was changed from Surinam on 23 January 1978.
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