UN founded
Argentina
Byelorussian SSR → Belarus
Brazil
Chile
China (seat held by the Republic of China) → China (seat transferred to the People's Republic of China) (Resolution 2758)
Cuba
Czechoslovakia → dissolved (current UN members that formerly comprised Czechoslovakia: Czech Republic and Slovakia)
Denmark
Dominican Republic
Egypt → United Arab Republic (period when merged with Syria) → Egypt
El Salvador
France
Haiti
Iran → Islamic Republic of Iran
Lebanon
Luxembourg
New Zealand
Nicaragua
Paraguay
Commonwealth of the Philippines → Philippine Republic → Philippines
Poland
Saudi Arabia
Soviet Union → Russia (successor state)
Syria → United Arab Republic (period when merged with Egypt) → Syrian Arab Republic
Turkey
Ukrainian SSR → Ukraine
United Kingdom of Great Britain and Northern Ireland
United States of America
Yugoslavia → dissolved (Federal Republic of Yugoslavia) current UN members that formerly comprised Yugoslavia: Bosnia and Herzegovina, Croatia, Republic of Macedonia, Montenegro, Serbia, and Slovenia
25 October 1945
Greece
30 October 1945
India
31 October 1945
Peru
1 November 1945
Australia
2 November 1945
Costa Rica
Liberia
5 November 1945
Colombia
7 November 1945
Mexico
Union of South Africa → South Africa
9 November 1945
Canada
13 November 1945
Ethiopia
Panama
14 November 1945
Bolivia → Bolivia (Plurinational Republic of)
15 November 1945
Venezuela → Venezuela (Bolivarian Republic of)
21 November 1945
Guatemala
27 November 1945
Norway
10 December 1945
Netherlands
17 December 1945
Honduras
18 December 1945
Uruguay
21 December 1945
Ecuador
Iraq
27 December 1945
Belgium