| Country | Head of State | Born | In Office | ||
| Netherlands | Queen Wilhelmina | 31 August | 1880 | 23 November | 1890 |
| Italy | King Victor Emanuel III | 11 November | 1869 | 29 July | 1900 |
| Norway | King Haakon VII | 3 August | 1872 | 18 November | 1905 |
| Sweden | King Gustaf V | 16 June | 1858 | 8 December | 1907 |
| Denmark Iceland | King Christian X | 26 September | 1870 | 14 May | 1912 |
| Bulgaria | King Boris III | 30 January | 1894 | 3 October | 1918 |
| Luxembourg | Grand Duchess Charlotte | 23 January | 1896 | 14 January | 1919 |
| Soviet Union | Chairman Mikhail Kalinin | 19 November | 1875 | 30 March | 1919 |
| Hungary | Regent Miklós Horthy | 18 June | 1868 | 1 March | 1920 |
| Vatican City (11 February 1929) | Pope Pius XI | 31 May | 1857 | 6 February | 1922 |
| Monaco | Prince Louis II | 12 July | 1870 | 26 June | 1922 |
| Poland | President Ignacy Mościcki | 1 December | 1867 | 4 June | 1926 |
| Portugal | President Óscar Carmona | 24 November | 1869 | 9 July | 1926 |
| Lithuania | President Antanas Smetona | 10 August | 1874 | 19 December | 1926 |
| Albania | King Zog I | 8 October | 1895 | 1 September | 1928 |
| Austria | President Wilhelm Miklas | 15 October | 1872 | 10 December | 1928 |
| Liechtenstein | Prince Franz | 28 August | 1853 | 11 February | 1929 |
| Romania | King Carol II | 16 October | 1893 | 8 June | 1930 |
| Finland | President Pehr Evind Svinhufvud | 15 December | 1861 | 2 March | 1931 |
| France | President Albert Lebrun | 29 August | 1871 | 10 May | 1932 |
| Estonia | PM/State Elder Konstantin Päts | 23 February | 1874 | 24 January | 1934 |
| Belgium | King Leopold III | 3 November | 1901 | 23 February | 1934 |
| Germany | Adolf Hitler, Führer & Reich Chancellor | 20 April | 1889 | 2 August | 1934 |
| Yugoslavia | King Peter II | 6 September | 1923 | 9 October | 1934 |
| Greece | King George II | 20 July | 1890 | 3 November | 1935 |
| Czechoslovakia | President Edvard Beneš | 17 May | 1894 | 18 December | 1935 |
| Switzerland | President Albert Meyer | 13 March | 1870 | 1 January | 1936 |
| United Kingdom Irish Free State | King Edward VIII | 23 June | 1894 | 20 January | 1936 |
| Latvia | President Kārlis Ulmanis | 4 September | 1877 | 11 April | 1936 |
| Spain | President Manuel Azaña | 10 January | 1880 | 10 May | 1936 |
