- Aberdeen, 4th earl of
- Aberdeen, earl of
- Adams, John
- Adams, John Quincy
- ADDINGTON, Henry
- Adenauer, Konrad
- Aelfred (the Great)
- Aelfweard
- Aethelred (Unraed)
- Aethelstan
- Afghanistan: Archontology
- Afghanistan: Head of State: 1996-2001
- Afghanistan: Head of State: 2021-2025
- Afghanistan: Heads of State: 1880-1973
- Afghanistan: Heads of State: 1973-1978
- Afghanistan: Heads of State: 1978-1992
- Afghanistan: Heads of State: 1992-1996
- Afghanistan: Heads of State: 2001-2021
- Afghanistan: Notes
- Afghanistan: Polity Style: 1880-2025
- Afghanistan: Polity Style: 1973-2025
- Afghanistan: Regional Rulers (Herat): 1842-1863
- Afghanistan: Regional Rulers (Kabul): 1818-1839
- Afghanistan: Regional Rulers (Kandahar): 1818-1855
- Afghanistan: Regional Rulers (Peshawar): 1818-1834
- Afghanistan: Rulers: 1747-1843
- Afghanistan: Rulers: 1843-1879
- Afghanistan: Rulers: 1880-1973
- Afghanistan: Sources
- Ahern, Bertie (Ó hEachthairn, Parthalán)
- Ajtakov, Nedirbaj
- Alabama: Archontology
- Alabama: Polity Style: 1817-2025
- Alabama: Sources
- Alabama: State Governors: 1819-1865
- Alabama: Territorial Governor: 1817-1819
- Alamán, Lucas
- Alawites: Archontology
- Alawites: Governors: 1920-1937
- Alawites: Polity Style: 1920-1936
- Alawites: Sources
- Albania: Archontology
- Albania: Glossary
- Albania: Heads of State: 1912-1916
- Albania: Heads of State: 1918-1925
- Albania: Heads of State: 1925-1939
- Albania: Heads of State: 1939-1944
- Albania: Heads of State: 1944-1991
- Albania: Heads of State: 1991-2025
- Albania: International Commission of Control: 1913-1914
- Albania: Polity Style: 1912-2025
- Albania: Sources
- Alcalá-Zamora, Niceto
- Aleppo: Archontology
- Aleppo: Heads of State: 1920-1925
- Aleppo: Polity Style: 1920-1922
- Alexander of Tunis, viscount of
- Alfonso XII
- Alfonso XIII
- Algeria: Archontology
- Algeria: Heads of State: 1962-2025
- Algeria: Polity Style: 1962-2025
- Algeria: Sources
- Almeida, António José de
- Amadeo I
- Anaya, Pedro María
- Andalucia: Archontology
- Andalucia: Polity Style: 1982-2025
- Andalucia: Presidents of the Junta: 1978-2025
- Andalucia: Sources
- Andorra: Archontology
- Andorra: Co-Rulers (Foix and France): 1278-1792
- Andorra: Co-Rulers (France): 1806-2025
- Andorra: Co-Rulers (Urgell): 1278-1812
- Andorra: Co-Rulers (Urgell):1814-2025
- Andorra: Notes
- Andorra: Polity Style: 1278-2025
- Andorra: Sources
- Andropov, Jurij
- Angola: Archontology
- Angola: Heads of State: 1975-2025
- Angola: Polity Style: 1975-2025
- Anne (England)
- Anne (Great Britain)
- Anne (Scotland)
- Antigua and Barbuda: Archontology
- Antigua and Barbuda: Governors-General: 1981-2025
- Antigua and Barbuda: Heads of State: 1981-2025
- Antigua and Barbuda: Laws 1981
- Antigua and Barbuda: Official Gazette 1982-03-01
- Antigua and Barbuda: Polity Style: 1967-2025
- Antigua and Barbuda: Sources
- Antioquia: Archontology
- Antioquia: Heads of State: 1811-1813
- Antioquia: Polity Style: 1811-1813
- Arago, François
- Aragon: Archontology
- Aragon: Polity Style: 1982-2025
- Aragon: Presidents of the Government: 1978-2025
- Aragon: Sources
- Araújo Lima, Pedro de
- Archontology: Nations
- Argentina: Archontology
- Argentina: Heads of State: 1825-1827
- Argentina: Heads of State: 1825-1827
- Argentina: Heads of State: 1852-1943
- Argentina: Heads of State: 1943-1983
- Argentina: Heads of State: 1983-2025
- Argentina: Notes
- Argentina: Polity Style: 1810-2025
- Argentina: Provisional Governments: 1810-1814
- Argentina: Sources
- Argentina: Supreme Directors: 1814-1820
- Arista, Mariano
- Arkansas: Archontology
- Arkansas: Polity Style: 1819-2025
- Arkansas: Sources
- Arkansas: State Governors: 1836-1865
- Arkansas: Territorial Governors: 1819-1836
- Armenia: Archontology
- Armenia: Chairman of the Military Revolutionary Committee: 1920-1921
- Armenia: Chairman of the Supreme Council: 1990
- Armenia: Chairmen of the Central Executive Committee: 1922-1938
- Armenia: Chairmen of the Presidium of the Supreme Council: 1938-1990
- Armenia: Heads of Government: 1918-1920
- Armenia: Heads of State: 1990-2025
- Armenia: Notes
- Armenia: Polity Style: 1918-1920
- Armenia: Polity Style: 1920-1990
- Armenia: Polity Style: 1990-2025
- Armenia: President of the Board of the Yerevan National Council: 1918
- Armenia: President of the Committee for the Salvation of Fatherland: 1921
- Armenia: President of the Council of Armenia: 1918-1919
- Armenia: President of the National Council: 1918
- Armenia: Presidents and Vice Presidents of the Parliament: 1919-1920
- Armenia: Sources
- Arnold, Karl
- Arriaga, Manuel José de
- Arthur of Connaught, Prince
- Arthur, Chester
- Artois, comte d'
- Asquith, Herbert Henry
- Asturias: Archontology
- Asturias: Polity Style: 1982-2025
- Asturias: President of the Regional Council: 1978-1982
- Asturias: Presidents of the Principality: 1982-2025
- Asturias: Sources
- Athlone, Earl of
- Athlone, earl of
- Attlee, Clement
- Auriol, Vincent
- Australia: Archontology
- Australia: Governors-General: 1901-2025
- Australia: Heads of State: 1901-2025
- Australia: Polity Style: 1901-2025
- Australia: Sources
- Austria: Archontology
- Austria: Heads of State: 1918-1938
- Austria: Heads of State: 1945-2025
- Austria: Notes
- Austria: Political Council of the Cabinet: 1945
- Austria: Polity Style: 1804-2025
- Austria: Reichsstatthalter: 1938-1939
- Austria: Sources
- Austria: State Council: 1918-1919
- Austrian Monarchy: Emperors: 1804-1918
- Azaña, Manuel
- Azaña, Manuel
- Azerbaijan: Archontology
- Azerbaijan: Chairman of the Provisional Revolutionary Committee: 1920-1921
- Azerbaijan: Chairmen of the Central Executive Committee: 1921-1938
- Azerbaijan: Chairmen of the Council of Ministers: 1946-1991
- Azerbaijan: Chairmen of the Council of People's Commissars: 1921-1946
- Azerbaijan: Chairmen of the Presidium of the Supreme Council: 1938-1990
- Azerbaijan: Heads of Government: 1918-1920
- Azerbaijan: Heads of Government: 1991-2025
- Azerbaijan: Heads of State: 1991-2025
- Azerbaijan: Polity Style: 1918-1920
- Azerbaijan: Polity Style: 1920-1991
- Azerbaijan: Polity Style: 1991-2025
- Azerbaijan: President and Vice Presidents of the Parliament: 1918-1920
- Azerbaijan: President of the National Council: 1918
- Azerbaijan: President of the Republic: 1990-1991
- Azerbaijan: Sources
Last update: 19 May 2025