1928 state leaders - Events of 1929 - 1930 state leaders - State leaders by year

Africa

• Ethiopia - Zauditu, Emperor of Ethiopia (1916-1930)
• Liberia - Charles D.B. King, President of Liberia (1920-1930)
• South Africa
  • Monarch - King George V, King of South Africa {1910-1936}
  • Governor-General - Earl of Athlone, Governor-General of South Africa, (1924-1931)
  • Prime Minister - Barry Herzog, Prime Minister of South Africa (1924-1939)
• Zanzibar - Sayyid Khalifa bin Harub Al-Busaid, Sultan of Zanzibar (1911-1960)

Asia

• Afghanistan
  • Monarch -
    1. Amanullah Shah, King of Afghanistan (1926-1929)
    2. Inayatullah Shah, King of Afghanistan (1929)
    3. Habibullah Ghazi , King of Afghanistan (1929)
    4. Mohammad Nadir Shah , King of Afghanistan (1929-1933)
  • Prime Minister - Sardar Mohammad Hashim Khan, Prime Minister of Afghanistan (1929-1946)
• Brunei - Ahmad Tajuddin, Sultan of Brunei (1924–1950)
• Republic of China
  • President - Chiang Kai-Shek, Chairman of the National Government (1928-1932)
  • Premier - Tan Yankai , President of the Executive Yuan (1928-1930)
• Japan
  • Monarch - Showa Emperor, Emperor of Japan (1926-1989)
  • Prime Minister -
    1. Giichi Tanaka, Prime Minister of Japan (1927-1929)
    2. Osachi Hamaguchi, Prime Minister of Japan (1929-1931)
• Oman - Taimur Bin Faisal, Sultan of Oman (1913-1932)

Australia and Oceania

• Australia -
  • Monarch - George V, King of the United Kingdom (1910-1936)
  • Governor-General - John Baird, 1st Baron of Stonehaven, Governor-General of Australia (1925-1931)
  • Prime Minister -
    1. Stanley Bruce, Prime Minister of Australia (1923-1929)
    2. James Scullin, Prime Minister of Australia (1929-1932)

Europe

• Albania - Zog I, King of Albania (1928-1939)
• Denmark
  • Monarch - Christian X, King of Denmark (1912-1947)
  • Prime Minister -
    1. Thomas Madsen-Mygdal, Prime Minister of Denmark (1926-1929)
    2. Thorvald Stauning, Prime Minister of Denmark (1929-1942)
• Finland -
  • President - Lauri Kristian Relander, President of Finland (1925-1931)
  • Prime Minister -
    1. Oskari Mantere , Prime Minister of Finland (1928-1929)
    2. Kyösti Kallio, Prime Minister of Finland (1929-1930)
• France -
  • President - Gaston Doumergue, President of France (1924-1931)
  • Prime Minister -
    1. Raymond Poincaré, President of the Council (1926-1929)
    2. Aristide Briand, President of the Council (1929)
    3. André Tardieu, President of the Council (1929-1930)
• Germany -
  • President - Paul von Hindenburg, President of Germany (1925-1934)
  • Chancellor - Hermann Müller, Chancellor of Germany (1928-1930)
• Irish Free State -
  • Monarch - George V, King of Ireland (1910-1936)
  • Governor-General - James McNeill, Governor-General of the Irish Free State (1928-1932)
  • Prime Minister - W.T. Cosgrave, President of the Executive Council of the Irish Free State (1922-1932)
• Italy -
  • Monarch - Vittorio Emanuele III, King of Italy (1900-1946)
  • Prime Minister - Benito Mussolini, Prime Minister of Italy (1922-1943)
• Latvia
  • President - Gustavs Zemgals, President of Latvia (1927-1930)
  • Prime Minister - Hugo Celmiņš, Prime Minister of Latvia (1928-1931)
• Romania - Michael, King of Romania (1927-1930)
• United Kingdom -
  • Monarch - George V, King of the United Kingdom (1910-1936)
  • Prime Minister -
    1. Stanley Baldwin, Prime Minister of the United Kingdom (1924-1929)
    2. Ramsay MacDonald, Prime Minister of the United Kingdom (1929-1935)
• Vatican City
  1. Gains independence from Italy, 7 June
  • Pope - Pius XI, Bishop of Rome (1929-1939)
  • Secretary of State - Pietro Cardinal Gasparri, Cardinal Secretary of State (1929-1930)

North America and the Caribbean

• Canada
  • Monarch - George V, King of Canada (1910-1936)
  • Governor-General - The Viscount Willingdon of Ratton, Governor-General of Canada (1926-1931)
  • Prime Minister - William Lyon Mackenzie King, Prime Minister of Canada (1926-1930)
• Newfoundland
  • Monarch - King George V, King of Newfoundland {1910-1936}
  • Governor - John Middleton, Governor of Newfoundland (1928-1932)
  • Prime Minister - Richard Squires, Prime Minister of Newfoundland (1928-1932)
• United States -
  1. Calvin Coolidge, President of the United States (1923-1929)
  2. Herbert Hoover, President of the United States (1929-1933)

South America

• Bolivia - Hernando Siles , President of Bolivia (1926-1930)
• Brazil - Washington Luís, President of Brazil (1926-1930)
• Colombia - Miguel Abadía Méndez , President of Colombia (1926-1930)
• Paraguay - José Patricio Gugguiari , President of Paraguay (1928-1931)
• Peru - Augusto B. Leguía y Salcedo, President of Peru (1919-1930)