List of monarchs of Tonga
| King of Tonga | |
|---|---|
| Incumbent | |
| Tupou VI since 18 March 2012 | |
| Details | |
| Style | His Majesty |
| Heir apparent | Tupoutoʻa ʻUlukalala |
| First monarch | George Tupou I |
| Formation | December 4, 1845 |
| Residence | Royal Palace, Nukuʻalofa |
| Constitution |
|---|
| Administrative divisions |
This is a list of monarchs of Tonga since 1845, after the Constitution of Tonga established the role of the monarch. The first constitutional monarch of Tonga was George Tupou I.