| 29 November 1879 |
3 July 1882 |
Treaty of Friendship and Commerce, between Great Britain and Tonga |
| 10 November 1880 |
10 November 1880 |
Declarations between Great Britain and Tonga, respecting the Delay in Exchange of Ratifications of the Treaty of Friendship, &c, of November 29, 1879 |
| 3 July 1882 |
3 July 1882 |
Protocol between Great Britain and Tonga, on the Exchange of Ratifications of the Treaty of Friendship &c. of the 29th November, 1879 (Extradition) |
| 2 June 1891 |
2 June 1891 |
Agreement between Great Britain and Tonga relative to the Trial of British Subjects by the Tongan Courts |
| 12 August 1927 |
12 August 1927 |
Agreement between the United Kingdom and Tonga concerning Amending Article V of Treaty of Friendship of May 18, 1900 |