Johore - 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 | |
| 28 August 1924 | 1 October 1925 | Convention and Protocol revising Universal Postal Convention of November 30, 1920 |
| 28 June 1929 | Postal Union Agreement regarding Insured Letters and Boxes |