Countries in the UN:

On 19 September 1991, the Byelorussian Soviet Socialist Republic informed the United Nations that it had changed its name to Belarus.

On Nov 30 1974, Dahomey informed the United Nations that it had changed its name to Republic of Benin.

On 7 April 2009, Bolivia changed its name to Bolivia (Plurinational State of).

The Republic of Bosnia and Herzegovina was admitted as a Member of the United Nations by General Assembly resolution A/RES/46/237 of 22 May 1992.

In 1984, Upper Volta informed the United Nations that it had changed its name to Burkina Faso.

The Republic of Cabo Verde changed its official name from The Republic of Cape Verde on 24 October 2013 in a request submitted to the Secretary-General by the country's Permanent Representative to the United Nations.

In 1970, Congo (Brazzaville) changed its name to the People's Republic of Congo, and on 15 November 1971 — to Congo.

In 1985, Ivory Coast informed the United Nations that it had changed its name to Côte d'Ivoire.

The Republic of Croatia was admitted as a Member of the United Nations by General Assembly resolution A/RES/46/238 of 22 May 1992.

In a letter dated 10 December 1992, its Permanent Representative informed the Secretary-General that the Czech and Slovak Federal Republic would cease to exist on 31 December 1992 and that the Czech Republic and the Slovak Republic, as successor States, would apply for membership in the United Nations.

Following the receipt of their application, the Security Council, on 8 January 1993, recommended to the General Assembly that the Czech Republic and the Slovak Republic be both admitted to United Nations membership. Both the Czech Republic and the Slovak Republic were thus admitted on 19 January of that year as Member States.

On 17 May 2016 the Permanent Mission of the Czech Republic to the United Nations informed the UN that the short name to be used for the country is Czechia.

Zaire joined the United Nations on 20 September 1960.

On 17 May 1997, its name was changed to the Democratic Republic of the Congo.

Egypt and Syria were original Members of the United Nations from 24 October 1945.

Following a plebiscite on 21 February 1958, the United Arab Republic was established by a union of Egypt and Syria and continued as a single Member.

On 13 October 1961, Syria, having resumed its status as an independent State, resumed its separate membership in the United Nations.

On 2 September 1971, the United Arab Republic changed its name to the Arab Republic of Egypt.

Further to the communication dated 30 May 2018 from the permanent mission addressed to the Protocol and Liaison Service, the country name was changed to the Kingdom of Eswatini (short form: Eswatini) from the former name of the Kingdom of Swaziland (former short form: Swaziland). Effective date: 19 April 2018.

The Federal Republic of Germany and the German Democratic Republic were admitted to membership in the United Nations on 18 September 1973. Through the accession of the German Democratic Republic to the Federal Republic of Germany, effective from 3 October 1990, the two German States united to form one sovereign State.

On 3 January 2018, the Permanent Mission of Guyana to the United Nations formally notified the United Nations that in accordance with the Constitution of Guyana the official name of the Republic of Guyana is “Co-operative Republic of Guyana.”

By letter of 20 January 1965, Indonesia announced its decision to withdraw from the United Nations "at this stage and under the present circumstances".

By telegram of 19 September 1966, it announced its decision "to resume full cooperation with the United Nations and to resume participation in its activities".

On 28 September 1966, the General Assembly took note of this decision and the President invited representatives of Indonesia to take seats in the Assembly.

On 5 March 1981, Iran informed the Secretary-General that it had changed its name to Iran (Islamic Republic of).

On 2 December 1975, Laos changed its name to the Lao People's Democratic Republic

In 1969, the Kingdom of Libya informed the United Nations that it had changed its name to Libyan Arab Jamahiriya.

Following the adoption by the General Assembly of resolution 66/1, the Permanent Mission of Libya to the United Nations formally notified the United Nations of a Declaration by the National Transitional Council of 3 August changing the official name of the Libyan Arab Jamahiriya to "Libya" and changing Libya's national flag.

On 22 December 2017, the Permanent Mission of Libya to the United Nations formally notified the United Nations that the government is changing the official name of Libya to “State of Libya.”

In 1975, Malagasy Republic changed its name to Madagascar.

The Federation of Malaya joined the United Nations on 17 September 1957. On 16 September 1963, its name was changed to Malaysia, following the admission to the new federation of Singapore, Sabah (North Borneo) and Sarawak.

Singapore became an independent State on 9 August 1965 and a Member of the United Nations on 21 September 1965.

Montenegro held a 21 May 2006 referendum and declared itself independent from Serbia on 3 June.

On 28 June 2006 Montenegro was accepted as a United Nations Member State by General Assembly resolution A/RES/60/264.

On 18 June 1989, the Union of Burma informed the United Nations that it had changed its name to the Union of Myanmar.

On 30 March 2011, the Union of Myanmar changed its name to the Republic of the Union of Myanmar.

On 26 June 2026, Nauru informed the United Nations that it had changed its name to Republic of Naoero.

By resolution A/RES/47/225 of 8 April 1993, the General Assembly decided to admit as a Member of the United Nations the State being provisionally referred to for all purposes within the United Nations as "The former Yugoslav Republic of Macedonia" pending settlement of the difference that had arisen over its name. Further to the communication dated 14 February 2019 from the Permanent Mission addressed to the Protocol and Liaison Service, the country name was changed to the Republic of North Macedonia (short form: North Macedonia) from the former name of The former Yugoslav Republic of Macedonia. Effective date: 14 February 2019.

In 1947, the Philippine Republic changed its name to Philippines.

The Union of Soviet Socialist Republics was an original Member of the United Nations from 24 October 1945.

In a letter dated 24 December 1991, Boris Yeltsin, the President of the Russian Federation, informed the Secretary-General that the membership of the Soviet Union in the Security Council and all other United Nations organs was being continued by the Russian Federation with the support of the 11 member countries of the Commonwealth of Independent States.

On 16 December 1986, Saint Christopher and Nevis changed its name to Saint Kitts and Nevis.

The Federal Republic of Yugoslavia was admitted as a Member of the United Nations by General Assembly resolution A/RES/55/12 of 1 November 2000.

On 4 February 2003, following the adoption and promulgation of the Constitutional Charter of Serbia and Montenegro by the Assembly of the Federal Republic of Yugoslavia, the official name of " Federal Republic of Yugoslavia" was changed to Serbia and Montenegro.

In a letter dated 3 June 2006, the President of the Republic of Serbia informed the Secretary-General that the membership of Serbia and Montenegro was being continued by the Republic of Serbia, following Montenegro's declaration of independence.

The Federation of Malaya joined the United Nations on 17 September 1957. On 16 September 1963, its name was changed to Malaysia, following the admission to the new federation of Singapore, Sabah (North Borneo) and Sarawak.

Singapore became an independent State on 9 August 1965 and a Member of the United Nations on 21 September 1965.

In a letter dated 10 December 1992, its Permanent Representative informed the Secretary-General that the Czech and Slovak Federal Republic would cease to exist on 31 December 1992 and that the Czech Republic and the Slovak Republic, as successor States, would apply for membership in the United Nations.

Following the receipt of their application, the Security Council, on 8 January 1993, recommended to the General Assembly that the Czech Republic and the Slovak Republic be both admitted to United Nations membership. Both the Czech Republic and the Slovak Republic were thus admitted on 19 January of that year as Member States.

The Republic of Slovenia was admitted as a Member of the United Nations by General Assembly resolution A/RES/46/236 of 22 May 1992.

In 1961, the Union of South Africa changed its name to South Africa.

The Republic of South Sudan formally seceded from Sudan on 9 July 2011 as a result of an internationally monitored referendum held in January 2011, and ‎was admitted as a new Member State ‎by the United Nations General Assembly on 14 ‎July 2011.

On 19 September 1991, Ceylon informed the United Nations that it had changed its name to Sri Lanka.

Egypt and Syria were original Members of the United Nations from 24 October 1945. Following a plebiscite on 21 February 1958, the United Arab Republic was established by a union of Egypt and Syria and continued as a single Member.

On 13 October 1961, Syria, having resumed its status as an independent State, resumed its separate membership in the United Nations. On 2 September 1971, the United Arab Republic changed its name to the Arab Republic of Egypt.

Tanganyika was a Member of the United Nations from 14 December 1961 and Zanzibar was a Member from 16 December 1963. Following the ratification on 26 April 1964 of Articles of Union between Tanganyika and Zanzibar, the United Republic of Tanganyika and Zanzibar continued as a single Member, changing its name to the United Republic of Tanzania on 1 November 1964.

On 11 May 1949, Siam informed the Secretary-General that it had changed its name to Thailand.

The Republic of Türkiye changed its official name from The Republic of Turkey on 26 May 2022 in a request submitted to the Secretary-General by the country's Minister of Foreign Affairs.

On 24 August 1991, the Ukrainian Soviet Socialist Republic changed its name to Ukraine.

Yemen was admitted to membership in the United Nations on 30 September 1947 and Democratic Yemen on 14 December 1967.

On 22 May 1990, the two countries merged and have since been represented as one Member with the name "Yemen".