| 26 November 1892 |
|
Notes between Great Britain and Bulgaria extending the Commercial Agreement of 1889 to December 31, 1893 |
| 9 December 1905 |
26 November 1907 |
Commercial Convention, Protocol, and Declaration between the United Kingdom and Bulgaria |
| 31 October 1908 |
|
Proces-verbal between the United Kingdom and Bulgaria respecting Customs Duties Supplementary to the Commercial Convention of December 9, 1905 |
| 9 February 1909 |
|
Additional Agreement between the United Kingdom and Bulgaria modifying the Convention of Commerce, Customs Duties, and Navigation of December 9, 1905 |
| 21 March 1923 |
|
Protocol recording the Arrangements for Reparation Payments by Bulgaria. |
| 28 March 1924 |
|
Protocol recording the Arrangements for the Recovery of the Cost of the Armies of Occupation in Bulgaria. |
| 28 March 1924 |
|
Protocol providing for the Division of any Sums recovered from Bulgaria for Reimbursement of the Cost of Military Occupation. |
| 12 November 1925 |
|
Notes Exchanged between the United Kingdom and Bulgaria providing for the Provisional Regulation of Commercial Relations between the two Countries |
| 12 August 1938 |
|
Exchange of Notes between His Majesty's Government in the United Kingdom and the Bulgarian Government regarding the Military, Naval and Air Clauses of the Treaty of Neuilly, &c. |
| 13 March 1948 |
|
United Kingdom Note concerning the continuance in force of the Agreement for the Exchange of Money Orders signed London/Sofia on 07:05 and 07:06:1925 [Bulgaria No.12. LNTS Vol. 38 p 154] |
| 28 February 1969 |
28 February 1969 |
Agreement for Co-operation in the Field of Applied Science and Technology between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the People's Republic of Bulgaria |