| 24 November 1837 |
|
Convention between Great Britain and France and Tuscany containing the Accession of the Grand Duke of Tuscany to Two Conventions between Great Britain and France, for the more effectual Suppression of the Slave Trade |
| 5 April 1847 |
|
Treaty of Commerce and Navigation, between Great Britain and Tuscany |
| 17 November 1853 |
|
Declarations exchanged between the Governments of Great Britain and of the Roman States, for securing National Treatment to the Vessels and Commerce of the one Country in the Ports of the other |
| 30 December 1854 |
|
Convention between Great Britain and Tuscany, for the Reciprocal Opening of the Coasting Trade |
| 26 November 1867 |
|
Declaration exchanged between Great Britain and Italy relative to Joint Stock Companies |
| 7 December 1870 |
|
Convention between Great Britain and Italy, Additional to the Postal Convention of December 12, 1857 between Great Britain and Sardinia |
| 16 October 1899 |
10 March 1900 |
Treaty between the United Kingdom and the Republic of San Marino for the Mutual Extradition of Fugitive Criminals |
| 1 March 1961 |
15 March 1961 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the Republic of San Marino concerning the acceptance of the British Visitor's Passport for travel between the United Kingdom and San Marino |
| 17 July 1961 |
22 July 1961 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Republic of San Marino concerning a Payment made to San Marino in respect of War Damage |