Sovereign states by year: List of sovereign states in 1917 – Events of 1918 – List of sovereign states in 1919

Sovereign States

A

• Albania – Principality of Albania
•  Andorra – Principality of Andorra
•  Argentina – Argentine Republic
• Armenia – Democratic Republic of Armenia (from May 28)
• Asir – Emirate of Asir
• Upper Asir – Emirate of Upper Asir
•  Australia – Commonwealth of Australia
•  Austria-Hungary – Austro-Hungarian Empire (to November 12)
• Azerbaijan – Azerbaijan Democratic Republic (from May 28)

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
•  Chile – Republic of Chile
•  China – Republic of China
•  Colombia – Republic of Colombia
•  Costa Rica – Republic of Costa Rica
•  Cuba – Republic of Cuba
• Czechoslovakia – Czecho-Slovak Republic (from 28 October)

D

•  Denmark – Kingdom of Denmark
•  Dominican Republic – Dominican Republic

E

•  Ecuador – Republic of Ecuador
•  El Salvador – Republic of El Salvador
•  Estonia – Republic of Estonia (from February 24)
• Ethiopia – Empire of Ethiopia

F

• Finland – Kingdom of Finland
• France – French Republic

G

• Georgia – Democratic Republic of Georgia (from May 26)
• German Austria – Republic of German Austria (from November 12)
• Germany – German Empire (to November 9)
  • German Reich (from November 9)
• Greece – Kingdom of Greece
•  Guatemala – Republic of Guatemala

H

• Ha'il – Emirate of Ha'il
•  Haiti – Republic of Haiti
•  Hejaz – Kingdom of Hejaz
•  Honduras – Republic of Honduras
• Hungary – Hungarian Democratic Republic (from November 16)

I

• Iceland – Kingdom of Iceland (from December 11)
• Italy – Kingdom of Italy

J

•  Japan – Empire of Japan

L

•  Latvia – Republic of Latvia (from November 18)
  • Latvian Socialist Soviet Republic (from December 17)
•  Liberia – Republic of Liberia
• Liechtenstein – Principality of Liechtenstein
•  Lithuania – Republic of Lithuania (from November 2)
•  Luxembourg – Grand Duchy of Luxembourg

M

•  Mexico – United Mexican States
•  Monaco – Principality of Monaco
• Montenegro – Kingdom of Montenegro (to 26 November)

N

• Nejd – Emirate of Nejd
•  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 (from November 11)
•  Portugal – Portuguese Republic

R

• Romania – Kingdom of Romania
• Russia – Russian Soviet Republic (to January 28)
  • Russian Soviet Federative Socialist Republic (from January 28)

S

•  San Marino – Most Serene Republic of San Marino
•  Serbia – Kingdom of Serbia (to December 1)
•  Serbs, Croats and Slovenes – Kingdom of Serbs, Croats, and Slovenes (from December 1)
•  Siam – Kingdom of Siam
• South Africa – Union of South Africa
• Slovenes, Croats and Serbs – State of Slovenes, Croats and Serbs (from October 28 to December 1)
• Spain – Kingdom of Spain
•  Sweden – Kingdom of Sweden
•  Switzerland – Swiss Confederation

T

• Transcaucasia – Transcaucasian Democratic Federative Republic (from February 24 to May 28)

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 (from November 1)

States Claiming Sovereignty

• Alash – Alash Autonomy
• Alsace – Alsace Soviet Republic (from November 9 to November 22)
• Alsace-Lorraine – Independent Republic of Alsace-Lorraine (from November 11 to November 17)
• Banat – Banat Republic (from October 31 to November 15)
• Belarus – Belarusian People's Republic (from March 25)
• Centrocaspian Dictatorship – Centrocaspian Dictatorship (from August 1 to September 15)
• Courland and Semigallia – Duchy of Courland and Semigallia (from March 8 to September 22)
• Crimea – Crimean People's Republic (to January)
• Don – Don Republic (from May 18)
• Donetsk-Krivoy Rog – Donetsk-Krivoy Rog Soviet Republic (from February 12 to March 20)
• Estonia – Commune of the Working People of Estonia (from November 29)
• Idel-Ural – Idel-Ural State (to April)
• Kars – Democratic Republic of South West Caucasus (from December 1)
•  Kuban – Kuban People's Republic (from January 28)
• Komancza – Komancza Republic (from November 4)
• Lado – Lado District
• Lemko-Rusyn – Lemko Rusyn Republic of Florynka (from December 5)
• Lithuania – Kingdom of Lithuania (from July 13 to November 2)
• Moldavia – Moldavian Democratic Republic (to April 9)
• Mountainous Armenia – Republic of Mountainous Armenia (from 1918 to later the same year)
• North Caucasian Emirate – North Caucasian Emirate (from 1918)
• Northern Caucasus – Mountainous Republic of the Northern Caucasus
•  Poland – Kingdom of Poland (to November 11)
• Tavolara – Kingdom of Tavolara
•  Tibet – Tibet
• Ukraine – Ukrainian People's Republic (to January 27)
  • Ukrainian State (from April 28 to December 14)
  • Ukrainian People's Republic (from December 14)
  • Ukrainian Soviet Socialist Republic
• West Ukraine – West Ukrainian National Republic (from October 19)
• Western Armenia – Administration for Western Armenia (to April 7)
• White Russia – Provisional All-Russian Government (from September 23)