Sovereign states by year: List of sovereign states in 1956 – Events of 1957 – List of sovereign states in 1958

Sovereign States

A

•  Afghanistan - Kingdom of Afghanistan
• Albania - People's Republic of Albania
•  Andorra - Principality of Andorra
•  Argentina - Argentine Republic
•  Australia - Commonwealth of Australia
•  Austria - Republic of Austria

B

•  Belgium - Kingdom of Belgium
• Bhutan - Kingdom of Bhutan
•  Bolivia - Republic of Bolivia
•  Brazil - Republic of the United States of Brazil
• Bulgaria - People's Republic of Bulgaria
•  Burma - Union of Burma

C

• Cambodia - Kingdom of Cambodia
•  Canada - Dominion of Canada
•  Ceylon - Dominion of Ceylon
•  Chile - Republic of Chile
• China (disputed between two governments)
  •  People's Republic of China
  •  Republic of China
•  Colombia - Republic of Colombia
•  Costa Rica - Republic of Costa Rica
•  Cuba - Republic of Cuba
•  Czechoslovakia - Czechoslovak Republic

D

•  Denmark - Kingdom of Denmark
•  Dominican Republic

E

•  Ecuador - Republic of Ecuador
•  Egypt - Republic of Egypt
•  El Salvador - Republic of El Salvador
• Ethiopia - Empire of Ethiopia

F

•  Finland - Republic of Finland
• France - French Republic

G

• Germany, East - German Democratic Republic
•  Germany, West - Federal Republic of Germany
•  Ghana (from March 6)
• Greece - Kingdom of Greece
•  Guatemala - Republic of Guatemala

H

•  Haiti - Republic of Haiti
•  Honduras - Republic of Honduras
• Hungary - People's Republic of Hungary

I

•  Iceland - Republic of Iceland
•  India - Republic of India
•  Indonesia - Republic of Indonesia
• Iran - Imperial State of Iran
• Iraq - Kingdom of Iraq
•  Ireland - Republic of Ireland
•  Israel - State of Israel
•  Italy - Italian Republic

J

•  Japan
•  Jordan - Hashemite Kingdom of Jordan

K

•  Korea, North - Democratic People's Republic of Korea
•  Korea, South - Republic of Korea

L

• Laos - Kingdom of Laos
•  Lebanon - Lebanese Republic
•  Liberia - Republic of Liberia
• Libya - United Kingdom of Libya
•  Liechtenstein - Principality of Liechtenstein
•  Luxembourg - Grand Duchy of Luxembourg

M

•  Malaya - Federation of Malaya (from August 31)
•  Mexico - United Mexican States
•  Monaco - Principality of Monaco
• Mongolia - People's Republic of Mongolia
•  Morocco - Kingdom of Morocco

N

• Nepal - Kingdom of Nepal
•  Netherlands - Kingdom of the Netherlands
• New Zealand - Dominion of New Zealand
•  Nicaragua - Republic of Nicaragua
•  Norway - Kingdom of Norway

P

•  Pakistan - Islamic Republic of Pakistan
•  Panama - Republic of Panama
• Paraguay - Republic of Paraguay
•  Peru - Peruvian Republic
•  Philippines - Republic of the Philippines
• Poland - People's Republic of Poland
•  Portugal - Portuguese Republic

R

• Romania - Romanian People's Republic

S

•  San Marino - Most Serene Republic of San Marino
• Saudi Arabia - Kingdom of Saudi Arabia
• South Africa - Union of South Africa
•  Soviet Union - Union of Soviet Socialist Republics
• Spain - Spanish State
•  Sudan - Republic of the Sudan
•  Sweden - Kingdom of Sweden
•  Switzerland - Swiss Confederation
•  Syria - Syrian Republic

T

•  Thailand - Kingdom of Thailand
•  Tunisia
  • Kingdom of Tunisia (to July 25)
  • Tunisian Republic (from July 25)
•  Turkey - Republic of Turkey

U

•  United Kingdom - United Kingdom of Great Britain and Northern Ireland
•  United States - United States of America
•  Uruguay - Eastern Republic of Uruguay

V

•  Vatican City - State of the Vatican City
•  Venezuela - United States of Venezuela
•  Vietnam, North - Democratic Republic of Vietnam
•  Vietnam, South - Republic of Vietnam

Y

• Yemen - Mutawakkilite Kingdom of Yemen
•  Yugoslavia - Federal People's Republic of Yugoslavia

United Nations Trust Territories

• Cameroons - British Cameroons (administered by the United Kingdom)
• Cameroun (administered by France)
  • Cameroun (to May 15)
  • Autonomous Republic of Cameroun (from May 15)
• Nauru (administered by Australia, New Zealand, and the United Kingdom)
• Papua and New Guinea - Territory of Papua and New Guinea (administered by Australia)
• Ruanda-Urundi (administered by Belgium)
• Somalia - Trust Territory of Somalia (administered by Italy)
•  Tanganyika (administered by the United Kingdom)
•  Togo - Autonomous Republic of Togo (administered by France)
• Trust Territory of the Pacific Islands (administered by the United States)
•  Western Samoa (administered by New Zealand)