| 18 April 1855 |
6 April 1856 |
Treaty of Friendship and Commerce, between Great Britain and Siam |
| 6 May 1869 |
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Treaty between Great Britain and Siam, respecting Quedah |
| 3 September 1883 |
7 May 1884 |
Treaty between Great Britain and Siam, for the Prevention of Crime in the Territiories of Chiengmai, Lakon, and Lampoonchi, and for the Promotion of Commerce between British Burmah and the Territories aforesaid |
| 31 December 1884 |
10 January 1885 |
Notes Exchanged between Great Britain and Siam Extending the Operation in Siam of the Treaty of September 3, 1883 |
| 30 November 1885 |
30 May 1885 |
Supplementary Article to the Treaty between Great Britain and Siam of September 3, 1883 relative to Extradition |
| 29 September 1896 |
28 October 1896 |
Notes Exchanged between Great Britain and Siam Extending the Operation in Siam of the Treaty of September 3, 1883 |
| 6 April 1897 |
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Convention between Great Britain and Siam undertaking on the part of Siam not to alienate certain Siamese Territories or grant Special Facilities without the consent of Great Britain |
| 29 November 1899 |
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Agreement between the United Kingdom and Siam relative to the Registration of British Subjects in Siam |
| 29 November 1899 |
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Agreement between the Government of Her Britannic Majesty, on behalf of the Sultans of Perak and Pahang, and the Government of His Siamese Majesty for the definition of Boundaries |
| 20 September 1900 |
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Agreement between the United Kingdom and Siam relative to Taxation on Land Held or Owned by British Subjects in Siam |
| 10 March 1909 |
9 July 1909 |
Treaty between the United Kingdom and Siam (With Annexes of 10 March 1909) |
| 4 March 1911 |
24 November 1911 |
Treaty between the United Kingdom and Siam respecting the Extradition of Fugitive Criminals |
| 20 November 1912 |
20 November 1912 |
Agreement between the United Kingdom and Siam respecting the Rendition of Fugitive Criminals between Certain States in the Malay Peninsula and Siam |
| 18 September 1913 |
18 September 1913 |
Agreement between the United Kingdom and Siam respecting the Rendition of Fugitive Criminals between the State of North Borneo and Siam |
| 6 November 1922 |
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Agreement with Siam and the Malay States respecting Customs |
| 6 September 1924 |
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Denunciation as from 6 December,1924 of Devawongse-Satow agreement of 28/1-2/2/1987 relating to trade across the Siam-Burma frontier |
| 30 September 1926 |
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Notes exchanged between the United Kingdom and Siam Respecting Drawbacks and the Method of Computing 'Ad Valorem' Rates under the Siamese Customs Law |
| 5 January 1928 |
27 February 1928 |
Exchange of Notes Extending the Extradition Treaty of 4 March 1911 to British Mandated Territories |
| 27 November 1931 |
22 April 1937 |
Agreement for the Control of Opium Smoking in the Far East supplementary to the Geneva Agreement of February 11, 1925 |
| 14 March 1932 |
7 April 1932 |
Exchange of Notes Extending the Extradition Treaty of 4 March 1911 to Transjordan. |
| 5 March 1937 |
6 September 1937 |
Exchange of Notes concerning the application of the Extradition Treaty of March 4, 1911 to Zanzibar Protectorate and British Solomon Islands Protectorate. |
| 31 March 1937 |
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Exchange of Notes between His Majesty's Government in the United Kingdom and the Government of India and the Government of Siam regarding the Nationality of Persons Affected by the Re-delimitation of the Boundary between Burma (Tenasserim) and Siam |
| 13 November 1937 |
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Exchange of Notes between His Majesty's Government in the United Kingdom and the Siamese Government for the Temporary Continuance of Rights Under the Treaties with Siam of 14 July 1937 |
| 23 November 1937 |
23 November 1937 |
Exchange of Notes between His Majesty's Government in the United Kingdom and the Government of Siam regarding the Right of Evocation from Siamese Courts under the Treaty of 14 July 1937 |
| 23 November 1937 |
19 November 1938 |
Treaty of Commerce and Navigation between His Majesty in respect of the United Kingdom and His Majesty the King of Siam [With Protocol and Exchanges of Notes] |
| 3 December 1937 |
3 December 1937 |
Exchange of Notes between His Majesty's Government in the United Kingdom and the Government of India and the Royal Siamese Government for the operation of regular Air Services over Siam and over India and Burma |
| 31 January 1940 |
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Exchange of Notes between the United Kingdom and Thailand amending the Exchange of Notes concerning Air Services over Thailand and over India and Burma of December 3, 1937 |
| 12 June 1940 |
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Treaty of Non-Aggression between His Majesty in respect of the United Kingdom and the King of Thailand |
| 24 June 1940 |
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Exchange of Notes between Thailand and Certain Malay States regarding Frontier Traffic - To Facilitate Crossing by Residents |
| 1 October 1940 |
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Exchanges of Notes between His Majesty's Government in the United Kingdom and the Government of Thailand regarding the Boundary between Burma and Thailand |
| 1 January 1946 |
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Exchange of Notes between Australia and Siam concerning Prelimary Agreement for Termination of State of War |
| 8 February 1946 |
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Exchange of Notes constituting an Agreement for the continued Application to New Zealand of the Extradition Treaty of March 4, 1911 as renewed in 1928. |
| 1 May 1946 |
6 May 1946 |
Agreement between the United Kingdom, the United States of America and Siam, concerning the Export of Siamese Rice and other Commodities in short world supply: With Exchanges of Notes and memorandum of Understanding (with United Kingdom and United States of America) dated 24:12:1946 [X-97-650] |
| 11 July 1946 |
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Exchange of Notes between the United Kingdom and Siam concerning Joint Claims Committee, under Articles II and III of Peace Agreement of 1 January 1946 |
| 7 December 1946 |
7 December 1946 |
Exchange of Notes and Memorandum of Understanding concerning the Export of Tin |
| 21 December 1946 |
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Exchange of Notes and Agreement. Restoration of property, rights and interests of British Companies owning Teak leases in Siam |
| 30 December 1946 |
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Agreement modifying Exchange of Notes of 7 December 1946 concerning Export of Tin |
| 6 January 1947 |
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Exchanges of Notes and Memorandum of Understanding concerning the Establishment of a British Commonwealth (United Kingdom, Australia and India) and Siamese Claims Committee for the settlement of War Claims Against Siam in respect of Loss or Damage to Property Rights and Interests |
| 17 March 1947 |
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Exchange of Notes between the United Kingdom and Siam regarding Elevation of Legations to Embassies London and Bangkok |
| 31 March 1947 |
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Agreement extending by 3 months the Memorandum of Understanding of 7 December 1946 concerning the Export of Tin |
| 5 April 1947 |
5 April 1947 |
Agreement, Appendix and Plans for the Sale or Lease of Property and Rights |
| 8 May 1947 |
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Exchange of Notes concerning Property, Rights and Interests of Allied Nationals in Siam |
| 8 May 1947 |
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Exchanges of Notes concerning Desequestration of Allied Banking and Commercial Concerns |
| 8 May 1947 |
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Exchange of Notes concerning Property, Rights and Interests of Allied Nationals in Siam |
| 30 June 1947 |
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Agreement relating to Tin |
| 17 December 1948 |
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Exchange of Notes Extending the Treaty of Commerce and Navigation of 1937 |
| 21 February 1950 |
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Agreement (and Annex) between Siam and Ceylon concerning Air Traffic |
| 4 May 1950 |
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Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand regarding the Settlement of outstanding Commonwealth War Claims against Thailand |
| 10 November 1950 |
10 November 1950 |
Agreement between the Government of the United Kingdom and the Government of Thailand for Air Services between and beyond their respective territories |
| 27 October 1951 |
|
Exchange of Notes between the United Kingdom and Thailand amending the Air Services Agreement of 10 November 1950 |
| 29 September 1952 |
29 September 1952 |
Exchange of Notes prolonging the Treaty of Commerce and Navigation of November 23, 1937 |
| 14 January 1954 |
14 January 1954 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand regarding the Agreement of the 1st of January, 1946 for the termination of the State of War |
| 5 April 1954 |
5 April 1954 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand amending the Schedule of Routes annexed to the Air Services Agreement of the 10th of November, 1950 |
| 24 August 1954 |
24 August 1954 |
Agreement between the Governments of the United Kingdom of Great Britain and Northern Ireland, Australia and India of the one part and the Government of Thailand of the other part regarding British Commonwealth War Graves in Thai Territory [with Exchange of Letters, Exchange of Notes and Plans] |
| 8 October 1956 |
8 October 1956 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand amending the Schedule to the Air Services Agreement signed at Bangkok on November 10, 1950 |
| 31 January 1957 |
31 January 1957 |
Memorandum on the disposal of former German Assets in Thailand |
| 28 April 1957 |
25 July 1957 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand concerning the reciprocal Waiver of Import Duties on Goods supplied under the Technical Co-operation Scheme of the Colombo Plan |
| 26 October 1959 |
5 November 1959 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand amending Section I of the Schedule of Routes annexed to the Air Services Agreement of November 10, 1950 |
| 28 December 1960 |
22 February 1961 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Royal Thai Government amending the Schedule of Routes annexed to the Air Services Agreement signed at Bangkok on November 10, 1950 |
| 15 February 1961 |
2 June 1961 |
Exchange of Notes betweenthe Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand amending the Schedule of Routes annexed to the Air Serivices Agreemen t of November 10, 1950 |
| 11 October 1962 |
20 November 1962 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand concerning the privileges to be granted to experts provided by their respective countries under the Technical Co-operation Scheme of the Colombo Plan |
| 3 January 1963 |
9 January 1963 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand concerning the Exchange of Official Publications |
| 12 March 1965 |
26 April 1965 |
Exchange of Notes containing an Agreement on the Privileges and Immunities in the United Kingdom of the South-East Asia Treaty Organisation |
| 16 August 1968 |
16 August 1968 |
Exchange of Notes between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Thailand amending the Air Services Agreement signed at Bankok on 10 November 1950 |