Perlis - Treaties
| Signed on | In force on | Title |
|---|---|---|
| 23 January 1912 | The International Opium Convention and Subsequent Relative Papers | |
| 28 October 1916 | Accession of States of Johore, Kedah, Perlis, Kelantan and Trengganu to Extradition Treaty between the United Kingdom and Siam of March 4, 1911 | |
| 30 November 1920 | Universal Postal Convention (Revision of Convention of May 26, 1906) | |
| 30 May 1924 | 23 May 1925 | Treaty between the United Kingdom and Finland for the Extradition of Criminals |