Kedah - Actions
| Agreement | Action type | Action on | Effective on |
|---|---|---|---|
| Accession of States of Johore, Kedah, Perlis, Kelantan and Trengganu to Extradition Treaty between the United Kingdom and Siam of March 4, 1911 | Accession | 28 October 1916 | |
| Universal Postal Convention (Revision of Convention of May 26, 1906) | Extension | 1 December 1921 |