This is a list of state leaders in the 20th century (1901–1950) AD, such as the heads of state, heads of government, and the general secretaries of single-party states.
These polities are generally sovereign states, but excludes minor dependent territories, whose leaders can be found listed under territorial governors in the 20th century. For completeness, these lists can include colonies, protectorates, or other dependent territories that have since gained sovereignty.
Leaders of constituent states within the British south Asia, are excluded, and found on this list of leaders in the 20th-century British south Asia.
Angola
Cameroon
Central African Republic
Chad
Congo: Belgian
Congo: French
Equatorial Guinea
Gabon
São Tomé and Príncipe
Great Lakes area
Horn of Africa area
Indian Ocean
Libya
Tunisia
Egypt
Sudan
Algeria
Morocco and Western Sahara
Botswana
Eswatini/ Swaziland
Lesotho
Malawi
Mozambique
Namibia
South Africa
Zambia
Zimbabwe
Benin
Burkina Faso
Cape Verde
Gambia
Ghana
Guinea
Guinea-Bissau
Ivory Coast
Liberia
Mali
Mauritania
Niger
Nigeria
Senegal
Sierra Leone
Togo
Antigua
The Bahamas
Barbados
Cuba
Dominica
Dominican Republic
Haiti
Netherlands
Saint Kitts and Nevis
Saint Lucia
Saint Vincent and the Grenadines
Trinidad and Tobago
Belize
Costa Rica
El Salvador
Guatemala
Honduras
Nicaragua
Panama
Canada
Mexico
United States
Argentina
Bolivia
Brazil
Chile
Colombia
Ecuador
Guyana
Paraguay
Peru
Suriname
Uruguay
Venezuela
Kazakhstan
Tibet
Uzbekistan
China: Qing dynasty
China: Since 1912
Japan
Korea
Mongolia
Russia
Brunei
Cambodia
Indonesia
Laos
Malaysia
Myanmar / Burma
Philippines
Singapore
Thailand
Timor
Vietnam
Afghanistan
Bahrain
Cyprus
Iran
Iraq
Israel
Jordan
Kuwait
Lebanon
Oman
Qatar
Saudi Arabia
Syria
Turkey
United Arab Emirates: Trucial States
Yemen: North
Yemen: South
Albania
Bulgaria
Greece
Yugoslavia
Estonia
Latvia
Lithuania
Ireland
United Kingdom
Austria
Czechoslovakia
Germany: Small states
Bavarian
Prussia
Upper Rhenish
Lower Saxon
Upper Saxon
Swabian
Germany: Unified states
Hungary
Liechtenstein
Poland
Switzerland
Moldova
Romania
Ukraine
Denmark
Finland
Iceland
Sweden and Norway
Norway
Sweden
Italy
Malta
San Marino
Vatican
Andorra
Portugal
Spain
Belgium
France
Luxembourg
Monaco
Armenia
Azerbaijan
Georgia
Australia
Papua New Guinea
Fiji
French Polynesia
New Zealand
Samoa and American Samoa
Solomon Islands
Tuvalu
Tonga
Vanuatu
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