Presentation of letters of introduction the chargé d´affaires (Tadeusz Grabowski), The Polish Legation in Sofia was officially opened: 02/1/1919, Information provided by Poland.
Note from the delegate of the Bulgarian government in Warsaw (Georgi Madżarov) to the Minister of Foreign Affairs of Poland (Eustachy Sapieha) with an official request to establish a Bulgarian legation in Warsaw and thus establish diplomatic relations: 11/1/1921.
Minister Eustachy Sapieha gave written consent to the request of the representative of Bulgaria - Establishment of diplomatic relations: 20/1/1921, Information provided by Poland.
Signing a credentials of the first Polish envoy to Bulgaria (Tadeusz Grabowski): 14/2/1925, Information provided by Poland.
Presentation of credentials of the Bulgarian envoy to Poland (Sawa Kirow): 26/6/1925, Information provided by Poland.
Bulgaria recognized the Provisional Government of National Unity in Warsaw: 16/7/1945, Information provided by Poland.
Note from the political representative office of the government of the Bulgarian Patriotic Front in Moscow to the Polish Embassy of the Provisional Government of National Unity in Moscow with a proposal to establish diplomatic relations: 20/8/1945, Information provided by Poland.
An approving note from the Polish Embassy of the Provisional Government of National Unity in Moscow to the Embassy of the Government of the Bulgarian Patriotic Front in Moscow with a proposal to publish a joint communiqué on this matter - Re-establishing of diplomatic relations: 24/8/1945, Information provided by Poland.
The Polish envoy (Edmund Zalewski) presented his credentials to the regents of the Kingdom of Bulgaria in Sofia: 27/12/1945, Information provided by Poland.
The Bulgarian envoy (Paweł Tagarow) presented his credentials to the president of the National Council (Bolesław Bierut) in Warsaw: 27/12/1945, Information provided by Poland.