| 17 October 1892 |
19 March 1894 |
Treaty between Great Britain and Portugal for the mutual surrender of fugitive criminals |
| 16 October 1899 |
10 March 1900 |
Treaty between the United Kingdom and the Republic of San Marino for the Mutual Extradition of Fugitive Criminals |
| 20 January 1932 |
10 July 1933 |
Convention between His Majesty, in respect of the United Kingdom, Australia, New Zealand, South Africa and India and the President of the Portuguese Republic Supplementary to the Extradition Treaty of October 17, 1892 With Exchange of Notes |
| 8 January 1940 |
8 February 1940 |
Exchange of Notes between His Majesty's Governments in the United Kingdom, the Commonwealth of Australia and New Zealand, and the Government of India and the Portuguese Government respecting Documents of Identity for Aircraft Personnel |