List of state leaders in 1921
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- 3.1 East, South and Southeast Asia
- 3.2 Middle East
- 3.3 Central Asia
Africa
- Ethiopia Empress: Zauditu (1916-1930)
- Liberia Heads of state and head of government: President Charles DB King (1920-1930)
- South Africa Head of state: King George V (1910-1936)
- Governor General Prince Arthur of Connaught (1920-1923)
- Head of government: Prime Minister Jan Smuts (1919-1924)
America
North America
- Canada Head of state: King George V (1910-1936)
- Governor General: United Kingdom ( 1916-19. July 1921 )
- Julian Byng, 1st Viscount Byng of Vimy (August 11, 1921-1926 )
- Head of government: Prime Minister Arthur Meighen ( 1920-29. December 1921 )
- Prime Minister William Lyon Mackenzie King (December 29, 1921-1926 )
- Mexico Heads of State and Head of Government: President Álvaro Obregón (1920-1924)
- Newfoundland Head of state: King George V (1910-1936)
- Governor General: Charles A. Harris (1917-1922)
- Head of government: Prime Minister Richard Squires (1919-1923)
- United States of America Heads of State and Head of Government: President Woodrow Wilson ( 1913-4. March 1921 )
- President Warren G. Harding (March 4, 1921 to 1923 )
Central America
- Costa Rica Heads of State and Head of Government: President Julio Acosta García (1920-1924)
- Dominican Republic Heads of State and Head of Government: Federico Henriquez (1916-1922)
- El Salvador Heads of state and head of government: President Jorge Meléndez (1919-1923)
- Guatemala Heads of State and Head of Government: President Carlos Herrera ( 1920-10. December 1921 )
- President José María Orellana (10 December 1921-1926 )
- Haiti Heads of State and Head of Government: President Philippe Sudre Dartiguenave (1915-1922)
- Honduras Heads of State and Head of Government: President Rafael López Gutiérrez (1920-1924)
- Cuba Heads of State and Head of Government: President Mario García Menocal ( 1913-20. May 1921 )
- President Alfredo Zayas y Alfonso (May 20, 1921-1925 )
- Nicaragua Heads of State and Head of Government: President Diego Manuel Chamorro Bolaños (January 1, 1921-1923 )
- Panama Heads of State and Head of Government: President Belisario Porras Barahona (1920-1924)
South America
- Argentina Heads of State and Head of Government: President Hipólito Yrigoyen Juan (1916-1922)
- Bolivia Heads of State and Head of Government: President Bautista Saavedra Mallea (28 January 1921-1925 )
- Brazil Heads of State and Head of Government: President Epitácio da Silva Pessoa (1919-1922)
- Chile Heads of State and Head of Government: President Arturo Alessandri (1920-1924)
- Ecuador Heads of State and Head of Government: President José Luis Tamayo (1920-1924)
- Colombia Heads of State and Head of Government: President Marco Fidel Suárez (1918 - November 1921 )
- General Jorge Holguín (November 11, 1921-1922 )
- Paraguay Heads of State and Head of Government: President Manuel Gondra ( 1920-31. October 1921 )
- President Félix Paiva ( 31 October-3 November 1921)
- President Eusebio Ayala (November 3, 1921 to 1923 )
- Peru Heads of State and Head of Government: President Augusto B. Leguía y Salcedo (1919-1930)
- Uruguay Heads of State and Head of Government: President Baltasar Brum (1919-1923)
- Venezuela Heads of state and head of government: President Juan Vicente Gómez (1915-1929)
Asia
East, South and Southeast Asia
- Bhutan Ruler: King Ugyen Wangchuk (1907-1926)
- China Head of state: President Xu Shichang (1918-1922)
- Head of government: Premier of the State Council Jin Yunpeng ( 1920-18. December 1921 )
- (acting) Yan Huiqing ( 18 December-24 December 1921)
- Premier of the State Council Liang Shiyi (24 December 1921-1922 )
- British India Kaiser: George V (1910-1936)
- Viceroy: Frederic Thesiger (1916-1921)
- Rufus Isaacs (1921-1925)
- Japan Head of State: Emperor Yoshihito (1912-1926)
- Head of government: Prime Minister Hara Takashi ( 1918-4. November 1921 )
- (acting) Foreign Minister Uchida Yasuya ( 4 November to 13 November 1921)
- Prime Minister Takahashi Korekiyo (November 13, 1921-1922 )
- Nepal Head of state: King Tribhuvan (1911-1955)
- Head of government: Prime Minister Chandra Shamsher Jang Bahadur Rana (1901-1929)
- Siam (now Thailand) Ruler: King Vajiravudh (1910-1925)
Southwest Asia
- Azerbaijan ( controversial, busy) Head of state:?
- Head of government:?
- Persia (now Iran) Head of state: Ahmad Shah Qajar (1909-1925)
- Head of government: Prime Minister Sepahdar A'zam (1920 - February 1921 )
- Prime Minister Seyyed Zia al Din Tabatabai ( February-May 1921)
- Prime Minister Ghavam os- Saltaneh (June 4, 1921 to 1922 )
- Georgia (disputed, occupied from March 21 ) Head of government: Prime Minister Noe Schordania ( 1918-17 March 1921. )
- Yemen Ruler Imam Yahya bin Muhammad (1918-1948)
- Transjordan (now Jordan) Ruler: Emir Abdallah ibn Husain I. (1921-1951)
Central Asia
- Afghanistan Ruler: Emir Amanullah Khan (1919-1929)
- Mongolia Head of state: Bogd Gegeen Dschebtsandampa (1911-1924)
- Head of government: Prime Minister Khatanbaatar Sandagdordschiin Magsardschaw (15th February-March 1921)
- Chairman of the Council of People's Commissars Dambyn Chadardsschaw ( 13 March-16 April 1921)
- Chairman of the Council of People's Commissars Dogsomyn Bodoo (April 16, 1921-1922 )
- Tibet ( disputed) Ruler: Dalai Lama Thubten Gyatso (1913-1933)
Australasia
- Australia Head of state: King George V (1910-1936)
- Head of government: Prime Minister Billy Hughes (1915-1923)
- New Zealand Head of state: King George V (1910-1936)
- Governor General Admiral John Jellicoe, 1st Viscount Jellicoe ( 1920-1924 )
- Head of government: Prime Minister William Massey (1912-1925)
Europe
- Albania Head of government: Prime Minister Ilias Bej Vrioni (1920-1921)
- Prime Minister Pandeli Evangjeli ( 1921)
- Prime Minister Hasan Bej Prishtina ( 1921)
- Prime Minister Omer Pasha Vrioni (1921-1922)
- Andorra Co - Prince: President of France: Alexandre Millerand (1920-1924)
- Bishop of Urgell: Justi Guitart i Vilardebó (1920-1940)
- Belgium Head of State: King Albert I (1909-1934)
- Head of government: Prime Minister Henri Carton de Wiart ( 1920-16. December 1921 )
- Prime Minister Georges Theunis (16 December 1921-1925 )
- Bulgaria Head of State: Tsar Boris III. (1918-1943)
- Head of government: Chairman of the Council of Ministers Stambolijski Aleksandar (1919-1923)
- Denmark Head of state: King Christian X (1912-1947)
- Head of government: Minister of State Niels Neergaard (1920-1924)
- German Empire Head of state: President Ebert (1919-1925)
- Head of government: Chancellor Konstantin Fehrenbach ( 1920-4. May 1921 )
- Chancellor Joseph Wirth (May 10, 1921-1922 )
- Estonia Heads of State and Head of Government: State elder Ants Piip ( 1920-25. January 1921 )
- State Elder Konstantin Pats (25 January 1921-1922 )
- Finland Head of state: President Kaarlo Juho Ståhlberg (1919-1925)
- Head of government: State Minister Rafael Erich ( 1920-9. April 1921 )
- State Minister Juho Vennola (9 April 1921-1922 )
- France Head of state: President Alexandre Millerand (1920-1924)
- Head of government: President of the Council of Ministers Georges Leygues ( 1920-16. January 1921 )
- President of the Council of Ministers Aristide Briand (January 16, 1921-1922 )
- Greece Head of state: King Constantine I (1920-1922)
- Head of government: Prime Minister Dimitrios Rallis ( 1920-6 February. , 1921 )
- Prime Minister Nicholas Kalogeropoulos ( 6 February to 8 April 1921)
- Prime Minister Dimitrios Gounaris (April 8, 1921 to 1922 )
- Italy Head of state: King Victor Emmanuel III. (1900-1946)
- Head of government: President of the Council of Ministers Giovanni Giolitti ( 1920-4. July 1921 )
- President of the Council of Ministers Ivanoe Bonomi (4 July 1921-1922 )
- Kingdom of Serbs, Croats and Slovenes (later Yugoslavia) Head of state: King Peter I ( 1918-16. August 1921 )
- King Alexander (August 16, 1921-1934 )
- Head of government: Prime Minister Milenko Vesnić (1920-1921)
- Prime Minister Nikola Pašić (1921-1924)
- Latvia Head of state: President Jānis Čakste (1918-1927)
- Head of government: Karlis Ulmanis Prime Minister ( 1918-19. June 1921 )
- Prime Minister Zigfrīds Anna Meierovics (19 June 1921-1923 )
- Liechtenstein Head of State: Prince Johann II (1858-1929)
- Prime Minister Josef Ospelt (March 2, 1921 to 1922 )
- Lithuania Head of state: President Aleksandra Stulginskis (1920-1926)
- Head of government: Prime Minister Kazys Grinius (1920-1922)
- Luxembourg Head of State: Grand Duchess Charlotte (1919-1964)
- Head of Government: Government President Emile Reuter (1918-1925)
- Monaco Prince Albert I (1889-1922) Head of government: Minister of State Raymond Le Bourdon (1918-1923)
- Netherlands Head of state: Queen Wilhelmina (1890-1948)
- Head of government: Prime Minister Charles de Ruijs Beerenbrouck (1918-1925)
- Norway Head of state: King Haakon VII (1906-1957)
- Head of government: Prime Minister Otto Bahr Halvorsen ( 1920-22. June 1921 )
- Prime Minister Otto Blehr (June 22, 1921-1923 )
- Ottoman Empire (now Turkey) Ruler: Sultan Mehmed VI. (1918-1922)
- Austria Head of State: President Michael Hainisch (1920-1928)
- Head of government: Chancellor Michael Mayr ( 1920-21. June 1921 )
- Chancellor Johann Schober (June 21, 1921-1922 )
- Poland Head of government: Prime Minister Wincenty Witos ( 1920-13. September 1921 )
- Prime Minister Antoni Ponikowski (September 19, 1921-1922 )
- Portugal Head of state: President António José de Almeida (1919-1923)
- Head of government: General Liberato Pinto Ribeiro ( 1920-2. March 1921 )
- Prime Minister Bernardino Machado ( 2 March to 23 May 1921)
- Prime Minister José Tomás de Barros Queirós ( 23 May to 30 August 1921)
- Prime Minister António Joaquim Granjo ( 30 August-19 October 1921)
- General Manuel Maria Coelho ( 19 October-5 November 1921)
- General Carlos Maia Pinto ( 5 November to 16 December 1921)
- Prime Minister Francisco Pinto da Cunha Leal (16 December 1921-1922 )
- Romania Head of state: King Ferdinand I (1914-1927)
- Head of government: Prime Minister Alexandru Averescu ( 1920-18. December 1921 )
- Prime Minister Antoni Ponikowski (18 December 1921-1922 )
- Russia Head of state: Chairman of the All-Russian Central Executive Committee Mikhail Ivanovich Kalinin ( since 1919, December 30, 1922: founding of the Soviet Union)
- Head of government: Chairman of the Council of People's Commissars Vladimir Ilyich Lenin (1917-1924, December 30, 1922: founding of the Soviet Union)
- San Marino Captains Regent: Carlo Balsimelli, Simone Michelotti ( 1920-1. April 1921 )
- Marino Della Balda, Vincenzo Francini ( 1 April to 1 October 1921)
- Egisto Morri, Giuseppe Lanci (October 1, 1921-1922 )
- Sweden Head of state: King Gustav V (1907-1950)
- Head of government: Prime Minister Gerhard Louis De Geer ( 1920-13 February. , 1921 )
- Prime Minister Oscar von Sydow ( 23 February to 13 October 1921)
- Prime Minister Hjalmar Branting (13 October 1921-1923 )
- Switzerland German President: Edmund Schulthess (1917, 1921, 1928, 1933)
- Federal: Camille Decoppet, Robert Haab, Heinrich Haberlin, Giuseppe Motta, Jean -Marie Musy, Karl Scheurer, Edmund Schulthess
- Spain Head of state: King Alfonso XIII. (1886-1931)
- Head of government: Government President Eduardo Dato Iradier ( 1920-8. March 1921 )
- (acting) Gabino Bugallal Araújo ( 8 March to 13 March 1921)
- Government President Manuel Allendesalazar Muñoz de Salazar ( 13 March to 14 August 1921)
- Government President Antonio Maura Montaner (August 14, 1921-1922 )
- Czechoslovakia Head of state: President Tomáš Masaryk (1918-1935)
- Head of government: Prime Minister Jan Černý ( 1920-26. September 1921 )
- Prime Minister Edvard Beneš (September 26, 1921-1922 )
- Ukraine ( controversial, busy) Heads of State and Head of Government: President Petljura Symon (1919-1922)
- Hungary Head of state: Regent Miklós Horthy (1920-1944)
- Head of government: Prime Minister, Count Pál Teleki ( 1920-14. April 1921 )
- Prime Minister Count István Bethlen (April 14, 1921-1931 )
- United Kingdom Head of state: King George V (1910-1936)
- Head of government: Prime Minister David Lloyd George Earl (1916-1922)
- Belarus ( controversial, busy) Heads of State and Head of Government:?