Sovereign States
editA
edit- Afghanistan - Emirate of Afghanistan
- Albania - Albanian Republic
- Andorra - Principality of Andorra
- Argentina - Argentine Republic
- Australia - Commonwealth of Australia
- Austria - Federal State of Austria
B
edit- Belgium - Kingdom of Belgium
- Bolivia - Republic of Bolivia
- Brazil - Republic of the United States of Brazil
- Bulgaria - Kingdom of Bulgaria
C
edit- 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 - Czechoslovak Republic
D
edit- Danzig - Free City of Danzig
- Denmark - Kingdom of Denmark
- Dominican Republic
E
edit- Ecuador - Republic of Ecuador
- Egypt - Kingdom of Egypt
- El Salvador - Republic of El Salvador
- Estonia - Republic of Estonia
- Ethiopia - Ethiopian Empire
F
editG
editH
edit- Haiti - Republic of Haiti
- Hejaz and Nejd (Personal Union)
- Honduras - Republic of Honduras
- Hungary - Kingdom of Hungary
I
editJ
edit- Japan - Empire of Japan
L
edit- Latvia - Republic of Latvia
- Liberia - Republic of Liberia
- Liechtenstein - Principality of Liechtenstein
- Lithuania - Republic of Lithuania
- Luxembourg - Grand Duchy of Luxembourg
M
edit- Mexico - United Mexican States
- Monaco - Principality of Monaco
- Mongolia - Mongolian People's Republic
N
edit- 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
P
edit- Panama - Republic of Panama
- Paraguay - Republic of Paraguay
- Persia - Imperial State of Persia
- Peru - Peruvian Republic
- Poland - Republic of Poland
- Portugal - Portuguese Republic
R
edit- Romania - Kingdom of Romania
S
edit- 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
- Soviet Union - Union of Soviet Socialist Republics
- Spain - Kingdom of Spain
- Sweden - Kingdom of Sweden
- Switzerland - Swiss Confederation
T
edit- Turkey - Republic of Turkey
U
edit- United Kingdom
- United Kingdom of Great Britain and Ireland (to April 12)
- United Kingdom of Great Britain and Northern Ireland (from April 12)
- United States - United States of America
- Uruguay - Eastern Republic of Uruguay
V
edit- Venezuela - United States of Venezuela
Y
edit- File:Flag of Yemen 1923.svg Yemen - Mutawakkilite Kingdom of Yemen
Other states
edit- Ararat - Republic of Ararat (from October)
- Tannu Tuva - Tuvan People's Republic
- Tavolara - Kingdom of Tavolara
- Tibet
League of Nations Mandates
edit- Alawite - Alawite State (administered by France)
- British Togoland (administered by the United Kingdom)
- Cameroons - British Cameroons (administered by the United Kingdom)
- Cameroun (administered by France)
- French Togoland (administered by France)
- For Jabal ad-Druze, see Souaida
- Lebanon - State of Greater Lebanon (administered by France)
- 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)
- Palestine - British Mandate of Palestine (administered by the United Kingdom)
- Ruanda-Urundi (administered by Belgium)
- Souaida (to 1927), Jabal ad-Druze (from 1927) (administered by France)
- State of Souaida (to 1927)
- Jebel Druze State (from 1927)
- South Pacific Mandate (administered by Japan)
- South-West Africa (administered by South Africa)
- Syria - State of Syria (administered by France)
- Tanganyika - Tanganyika Territory (administered by the United Kingdom)
- Transjordan - Emirate of Transjordan (administered by the United Kingdom)
- Western Samoa (administered by New Zealand)