List of sovereign states in 1921

Sovereign states

Political map of the world in 1921

A

• Abkhazia - Socialist Soviet Republic of Abkhazia (from March 31)
• Afghanistan - Emirate of Afghanistan
• Albania - Principality of Albania
• Andorra - Principality of Andorra
• Argentina - Argentine Republic
• Armenia - Armenian Socialist Soviet Republic
• Asir - Emirate of Asir
• Australia - Commonwealth of Australia
• Austria - Federal State of Austria
• Azerbaijan - Azerbaijan Socialist Soviet Republic

B

• Belgium - Kingdom of Belgium
• Bolivia - Republic of Bolivia
• Brazil - Republic of the United States of Brazil
• Bulgaria - Kingdom of Bulgaria

C

• Canada - Dominion of Canada
• Central America - Federation of Central America (from October 1)
• Chile - Republic of Chile
• China - Republic of China
• Colombia - Republic of Colombia
• Costa Rica - Republic of Costa Rica
• Cuba - Republic of Cuba
• Czechoslovakia - Czechoslovak Republic

D

• Danzig - Free City of Danzig
• Denmark - Kingdom of Denmark
• Dominican Republic

E

• Ecuador - Republic of Ecuador
• El Salvador - Republic of El Salvador (to October 1)
• Estonia - Republic of Estonia
• Ethiopia - Ethiopian Empire

F

• Finland - Republic of Finland
• Fiume - Free State of Fiume
• France - French Republic

G

• Georgia - Democratic Republic of Georgia (to February 11)
• Germany - German Reich
• Greece - Kingdom of Greece
• Guatemala - Republic of Guatemala (to October 1)

H

• Ha'il - Emirate of Ha'il (to November 2)
• Haiti - Republic of Haiti
• Hejaz - Kingdom of Hejaz
• Honduras - Republic of Honduras (to October 1)
• Hungary - Kingdom of Hungary

I

• Iceland - Kingdom of Iceland
• Italy - Kingdom of Italy

J

• Japan - Empire of Japan

L

• Latvia - Republic of Latvia
• Liberia - Republic of Liberia
• Liechtenstein - Principality of Liechtenstein
• Lithuania - Republic of Lithuania
• Luxembourg - Grand Duchy of Luxembourg

M

• Mexico - United Mexican States
• Monaco - Principality of Monaco
• Mongolia - Mongolian People's Government (from July 11)

N

• Nejd
  • Emirate of Nejd (to August 22)
  • Sultanate of Nejd (from August 22)
• Nepal - Kingdom of Nepal
• Netherlands - Kingdom of the Netherlands
• Newfoundland - Dominion of Newfoundland
• New Zealand - Dominion of New Zealand
• Nicaragua - Republic of Nicaragua
• Norway - Kingdom of Norway

O

• Ottoman Empire - Sublime Ottoman State

P

• Panama - Republic of Panama
• Paraguay - Republic of Paraguay
• Persia - Persian Empire
• Peru - Peruvian Republic
• Poland - Republic of Poland
• Portugal - Portuguese Republic

R

• Romania - Kingdom of Romania
• Russia - Russian Socialist Federative Soviet Republic

S

• San Marino - Most Serene Republic of San Marino
• Serbs, Croats and Slovenes - Kingdom of Serbs, Croats, and Slovenes
• Siam - Kingdom of Siam
• South Africa - Union of South Africa
• Spain - Kingdom of Spain
• Sweden - Kingdom of Sweden
• Switzerland - Swiss Confederation

U

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

V

• Venezuela - United States of Venezuela

Y

• Yemen - Mutawakkilite Kingdom of Yemen

Other states

• Armenia, Mountainous (from April 26 to July)
• Baranya-Baja - Serb-Hungarian Baranya-Baja Republic (from August 14 to August 25)
• Bottleneck - Free State Bottleneck
• Bukharan - Bukharan People's Soviet Republic
• Byelorussia - Byelorussian Socialist Soviet Republic
• Central Lithuania - Republic of Central Lithuania
• Far Eastern Republic
• Georgia, Soviet - Socialist Soviet Republic of Georgia (from February 11)
• Gilan - Persian Socialist Soviet Republic (to September)
• Ireland - Irish Republic
• Khorezm - Khorezm People's Soviet Republic
• Labin - Labin Republic (from March 2 to April 8)
• Lajtabánság - Banat of Leitha (from October 4 to November 5)
• Mirdita - Republic of Mirdita (from July 17 to November 20)
• Mongolia - Boghda Khaanate of Mongolia (to July 11)
• North Caucasian Emirate
• Rif - Confederal Republic of the Tribes of the Rif (from September 18)
• Tannu Tuva - People's Republic of Tannu Tuva (from August 14)
• Tavolara - Kingdom of Tavolara
• Tibet
• Ukraine, Soviet - Ukrainian Socialist Soviet Republic

League of Nations Mandates

• Mesopotamia - British Mandate of Mesopotamia (administered by the United Kingdom)
• Nauru (administered by Australia, New Zealand and the United Kingdom)
• New Guinea - Territory of New Guinea (administered by Australia)
• South Pacific Mandate (administered by Japan)
• Western Samoa (administered by New Zealand)