| Sovereign | Birthdate | Reign | Deathdate (if different) |
|
| Began | Ended | |||
| Otto I | 1815 | 1832 | 1862 | 1867 |
| George I | 1845 | 1863 | 1913 | |
| Constantine I | 1868 | 1913 | 1917 | 1923 |
| 1920 | 1922 | |||
| Alexander I | 1893 | 1917 | 1920 | |
| George II | 1890 | 1922 | 1924 | |
| 1935 | 1947 | |||
| Paul I | 1901 | 1947 | 1964 | |
| Constantine II | 1940 | 1964 | 1973 | 2023 |
Guests at the wedding of Princess Theodora and Matthew Kumar, Athens, 28 September 2024