Sovereign-state flags in 1921

Sovereign states

Abkhazia (from 31 March)

Afghanistan - variant

Afghanistan - variant

Albania

Andorra - variant

Andorra - variant

Argentina

Armenia

Asir

Aussa

Australia

Austria

Azerbaijan (until 1921)

Azerbaijan (from 1921)

Belgium

Bolivia

Brazil

Bulgaria

Canada

Chile

China

Colombia

Costa Rica

Cuba

Czechoslovakia

Danzig

Denmark

Dominican Republic

Ecuador

El Salvador

Estonia

Ethiopia

Finland

Fiume

France

Georgia (until 11 February)

Georgia (from 11 February)

Germany

Greece

Guatemala

Haʾil (until 2 November)

Haiti

Hejaz

Honduras

Hungary

Iceland

Italy

Japan

Latvia

Liberia

Liechtenstein (until 1921)

Liechtenstein (from 1921)

Lithuania

Luxembourg

Mexico

Monaco

Mountain Republic (until 20 January)

Muscat and Oman

Nejd and Hasa (until 22 August)

Nejd (from 22 August)

Netherlands

Newfoundland

New Zealand

Nicaragua

Norway

Ottoman Empire

Panama

Paraguay

Paraguay

Persia

Peru

Poland

Portugal

Romania

Russia

San Marino

Serbs, Croats and Slovenes

Siam

South Africa

Spain

Sweden

Switzerland

Tibet

United Kingdom

United States

Uruguay

Venezuela

Yemen

Colonies, concessions, possessions, protectorates, mandates and territories

Nauru (Australia)

New Guinea (until mid-1921; Australia)

New Guinea (from mid-1921; Australia)

Norfolk Island (Australia)

Papua (Australia)

Belgian Congo (Belgium)

Ruanda-Urundi (Belgium)

Tientsin (Belgium)

Anglo-Egyptian Sudan (Egypt and United Kingdom)

Åland (until 1921; Finland)

Åland (from 1921; Finland)

Alawite State (France)

French Algeria (France)

French Cameroon (France)

French Chad (France)

French Equatorial Africa (France)

French Guiana (France)

French India (France)

French Indochina (France)

French Madagascar (France)

French Morocco (France)

French Polynesia (France)

French Somaliland (France)

French Togoland (France)

French Tunisia (France)

French West Africa (France)

Gambier Islands (France)

Guadeloupe (France)

Hankou (France)

Martinique (France)

New Caledonia (France)

New Hebrides (France)

Réunion (France)

Saint Pierre and Miquelon (France)

Shanghai (France)

Tientsin (France)

Ubangi-Shari (France)

Wallis and Futuna (France)

Greater Lebanon (France)

Jabal Druze State (from 1 May; France)

Saar Basin (France)

Amoy (Italy)

Italian Cyrenaica (Italy)

Italian Eritrea (Italy)

Italian Somaliland (Italy)

Italian Tripolitania (Italy)

Shanghai (Italy)

Tientsin (Italy)

Chongqing (Japan)

Hangzhou (Japan)

Hankou (Japan)

Japanese Korea (Chōsen) (Japan)

Karafuto (Japan)

Kwantung (Japan)

Shashi (Japan)

South Seas Mandate (Japan)

Suzhou (Japan)

Taiwan (Japan)

Tientsin (Japan)

Curaçao and Dependencies (Netherlands)

Dutch East Indies (Netherlands)

Surinam (Netherlands)

Cook Islands (New Zealand)

Niue (New Zealand)

Western Samoa (New Zealand)

Sverdrup Islands (Norway)

Portuguese Cape Verde (Portugal)

Portuguese Macau (Portugal)

Portuguese East Africa (Portugal)

Portuguese Guinea (Portugal)

Portuguese India (Portugal)

Portuguese Timor (Portugal)

Portuguese West Africa (Portugal)

Fort of São João Baptista de Ajudá (Portugal)

Portuguese São Tomé and Príncipe (Portugal)

Uryankhay (until 14 August; Russia)

South West Africa (South Africa)

Elobey, Annobón, and Corisco (Spain)

Fernando Poo (Spain)

Río Muni (Spain)

Spanish North Africa (Spain)

Spanish Sahara (Spain)

Spanish Morocco (Spain)

Aden (United Kingdom)

Amoy (United Kingdom)

Ascension Island (United Kingdom)

Bahamas (United Kingdom)

Bahrain (United Kingdom)

Baker Island (United Kingdom)

Barbados (United Kingdom)

Basutoland (United Kingdom)

Bechuanaland (United Kingdom)

Bermuda (United Kingdom)

Bhutan (United Kingdom)

British Cameroon (United Kingdom)

British Guiana (United Kingdom)

British Honduras (United Kingdom)

British Leeward Islands (United Kingdom)

British Somaliland (United Kingdom)

British Togoland (United Kingdom)

British Western Pacific Territories (United Kingdom)

British Windward Islands (United Kingdom)

Brunei (United Kingdom)

Ceylon (United Kingdom)

Cyprus (United Kingdom)

Egypt (United Kingdom)

Falkland Islands (United Kingdom)

Federated Malay States (United Kingdom)

Fiji (United Kingdom)

Gambia (United Kingdom)

Gibraltar (until mid-1921; United Kingdom)

Gibraltar (from mid-1921; United Kingdom)

Gold Coast (United Kingdom)

Guernsey (United Kingdom)

Hankou (United Kingdom)

Heard Island and McDonald Islands (United Kingdom)

British Hong Kong (United Kingdom)

British India (United Kingdom)

Iraq (from 23 August; United Kingdom)

Isle of Man (United Kingdom)

Jamaica (United Kingdom)

Kenya (United Kingdom)

Jarvis Island (United Kingdom)

Jersey (United Kingdom)

Jiujiang (United Kingdom)

Johor (United Kingdom)

Kedah (United Kingdom)

Kelantan (United Kingdom)

Kuwait (until mid-1921; United Kingdom)

Kuwait (from mid-1921; I United Kingdom)

Maldives (United Kingdom)

Malta (United Kingdom)

Mauritius (United Kingdom)

Nepal (United Kingdom)

Nigeria (United Kingdom)

North Borneo (United Kingdom)

Northern Rhodesia (United Kingdom)

Nyasaland (United Kingdom)

Palestine (United Kingdom)

Perlis (United Kingdom)

Qatar (United Kingdom)

Saar Basin (United Kingdom)

Saint Helena (United Kingdom)

Sarawak (United Kingdom)

Seychelles (United Kingdom)

Sierra Leone (United Kingdom)

Sikkim (United Kingdom)

South Orkney Islands (United Kingdom)

Southern Rhodesia (United Kingdom)

South Shetland Islands (United Kingdom)

Straits Settlements (United Kingdom)

Suez Canal Zone (United Kingdom)

Swaziland (United Kingdom)

Tanganyika (United Kingdom)

Terengganu (United Kingdom)

Tientsin (United Kingdom)

Transjordan (from 11 April; United Kingdom)

Trinidad and Tobago (United Kingdom)

Tristan da Cunha (United Kingdom)

Trucial States (United Kingdom)

Uganda (United Kingdom)

Union Islands (United Kingdom)

Victoria Land (United Kingdom)

Weihaiwei (United Kingdom)

Zanzibar (United Kingdom)

Zhenjiang (United Kingdom)

Alaska (United States)

American Samoa (United States)

Corn Islands (United States)

Guam (United States)

Hawaii (United States)

Howland Island (United States)

Johnston Atoll (United States)

Kingman Reef (United States)

Midway Atoll (United States)

Navassa Island (United States)

Panama Canal Zone (United States)

Petrel Islands (United States)

Philippine Islands (United States)

Puerto Rico (United States)

Quita Sueno Bank (United States)

Roncador Bank (United States)

Serrana Bank (United States)

Serranilla Bank (United States)

Swan Islands (United States)

United States Virgin Islands (until 17 May; United States)

United States Virgin Islands (from 17 May; United States)

Australian states

New South Wales

Queensland

South Australia

Tasmania

Victoria

Western Australia

Canadian states

Alberta

British Columbia

Manitoba

New Brunswick

Northwest Territories

Nova Scotia

Ontario

Prince Edward Island

Quebec

Saskatchewan

Yukon Territory

Constituent U.S. states

Alabama

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

Florida

Georgia

Idaho

Illinois

Indiana

Iowa (until 29 March)

Iowa (from 29 March)

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Montana

Nebraska

Nevada

New Hampshire

New Jersey

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

Other entities

Adjara (from 30 June)

Åland (until 1921)

Alash

Alchensk

Altai

Aras (until 1921)

Arar (from 1921)

Armenistan (from 26 April)

Astana

Azadistan

Baranya–Baja (from 14 August)

Bottleneck

Bukhara (until 23 September)

Bukhara (from 23 September)

Byelorussia

Central Lithuania

Don

Far Eastern Republic

Galicia

Gilan (until 1921)

Hutsul Republic

Ireland

Jabal Druze State (until 1921)

Karelia

Khorasan

Khorezm (until May)

Khorezm (from May)

Komancza

Provisional Government of the Republic of Korea

Kuban

Kurdistan (from September)

Labin (from 7 March)

Leitha (from 4 October)

Lemko Republic

Mirdita (from 17 July)

Mongolia (from 21 February)

North Ingria (from 5 December)

Perloja

Rif (from 21 September)

Tanna Tuva (from 14 August)

Ukrainian Socialist Soviet Republic

Shanxi chique

Ma chinque

Yunann chique

New Guangxi clique

Other culturals

Buddhism

Esperanto

Pan-African Flag