Country | Sovereign | Born | Acceded | Consort (born) | Heir (born) |
 Kingdom of Bulgaria |  King Simeon II | 16 Jun 1937 | 28 Aug 1943 |  Queen Margarita (1935) |  Prince Boris (1997) |
 Kingdom of Serbia |  King Alexander II | 17 Jul 1945 | 3 Nov 1970 |  Queen Katherine (1943) |  Crown Prince Peter (1980) |
Kingdom of Sweden |  King Carl XVI Gustaf | 30 Apr 1946 | 15 Sept 1973 |  Queen Silvia (1943) |  Crown Princess Victoria (1977) |
 Kingdom of Portugal |  King Duarte III | 15 May 1945 | 24 Dec 1976 |  Queen Isabel (1966) |  Afonso, Prince of Beira (1996) |
 Kingdom of Montenegro |  King Nikola II | 7 Jul 1944 | 24 Mar 1986 | |  Crown Prince Boris (1980) |
 Principality of Liechtenstein |  Prince Hans Adam II | 14 Feb 1945 | 13 Nov 1989 | |  Her. Prince Alois (1968) |
 Kingdom of Norway |  King Harald V | 21 Feb 1937 | 17 Jan 1991 |  Queen Sonja (1937) |  Crown Prince Haakon (1973) |
 Russian Empire |  Empress Maria I | 23 Dec 1953 | 21 Apr 1992 | |  Tsarevich Georgiy (1981) |
 Kingdom of Germany |  High King Georg Friedrich I | 10 Jun 1976 | 26 Sept 1994 |  High Queen Sophie (1979) | Crown Prince Carl Friedrich (2013) |
 Grand Duchy of Luxembourg |  Grand Duke Henri | 16 Apr 1955 | 7 Oct 2000 |  Grand Duchess Maria Teresa (1956) |  Her. Grand Duke Guillaume (1981) |
Principality of Monaco |  Prince Albert II | 14 Mar 1958 | 6 Apr 2005 |  Princess Charlene (1978) |  Prince Jacques (2014) |
 Imperial Commonwealth (Austria, Hungary, Bohemia, Slovakia, Slovenia, Croatia, Bosnia) |  Emperor Karl II | 11 Jan 1961 | 4 Jul 2011 | |  Crown Prince Ferdinand (1997) |
 Kingdom of Albania | 
King Leka II | 26 Mar 1982 | 30 Nov 2011 |  Queen Elia (1983) |  Crown Princess Geraldine (2020) |
 Kingdom of the Netherlands |  King Willem-Alexander | 27 Apr 1967 | 30 Apr 2013 |  Queen Maxima (1971) |  Catherina Amalia, Princess of Orange (2003) |
 Kingdom of Belgium |  King Philippe | 15 Apr 1960 | 21 Jul 2013 |  Queen Mathilde (1973) |  Princess Elisabeth, Duchess of Brabant (2001) |
 Kingdom of Spain |  King Felipe VI | 30 Jan 1968 | 19 Jun 2014 |  Queen Letizia (1972) |  Leonor, Princess of Asturias (2005) |
 Kingdom of Romania |  Queen Margareta | 26 Mar 1949 | 5 Dec 2017 |  Prince Radu (1960) |  Princess Elena (1950) |
 Kingdom of France |  King Jean IV | 19 May 1965 | 21 Jan 2019 |  Queen Philomena (1977) |  Prince Gaston, Dauphin (2009) |
 Kingdom of Italy |  King Aimone | 13 Oct 1967 | 1 Jun 2021 |  Queen Olga (1971) |  Prince Umberto (2009) |
United Kingdom of Great Britain & Northern Ireland |  King Charles III | 14 Nov 1948 | 8 Sept 2022 |  Queen Camilla (1947) |  Prince William, Prince of Wales (1982) |
 Kingdom of Greece |  King Pavlos II | 20 May 1967 | 10 Jan 2023 |  Queen Marie-Chantal (1968) |  Crown Prince Constantine (1998) |
 Kingdom of Denmark |  King Frederik X | 26 May 1968 | 14 Jan 2024 |  Queen Mary (1972) |  Crown Prince Christian (2005) |