| 9 July 1931 |
13 May 1932 |
Convention between His Majesty, in respect of the United Kingdom, and the President of the Portuguese Republic regarding Legal Proceedings in Civil and Commercial Matters |
| 11 October 1947 |
23 March 1950 |
Convention of the World Meteorological Organization |
| 11 December 1953 |
1 July 1954 |
European Interim Agreement on Social Security Schemes relating to Old Age, Invalidity and Survivors [ETS No. 12] |
| 11 December 1953 |
1 July 1954 |
European Interim Agreement on Social Security other than Schemes for Old Age, Invalidity and Survivors [ETS No. 13] |
| 11 December 1953 |
1 October 1954 |
Protocol to the European Interim Agreement on Social Security Schemes relating to Old Age, Invalidity and Survivors [ETS No. 12A] |
| 11 December 1953 |
1 October 1954 |
Protocol to the European Interim Agreement on Social Security other than Schemes for Old Age, Invalidity and Survivors [ETS No. 13A] |
| 20 April 1959 |
4 September 1960 |
European Agreement on the Abolition of Visas for Refugees [ETS No. 31] |
| 24 February 1961 |
15 March 1961 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Portugal concerning the acceptance of the British Visitor's Passport for travel between the United Kingdom and Portugal, including the Azores and Madeira |
|
1 October 1952 |
International Sanitary Regulations adopted by the World Health Assembly on May 25, 1951 |