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| 1948, Aug. 11 |
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| The Bulgarian Social Democratic Party and the Communist Party declared their merger as the Bulgarian Communist Party. | 1 |
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| 1949, Jan. 1 |
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| A five-year plan was inaugurated. | 2 |
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| June 25 |
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| Communist deputy premier Traicho Kostov was arrested and charged with ideological deviation and treason. Together with ten associates, he was later found guilty; he was executed on Dec. 16. | 3 |
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| July 2 |
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| Premier Dimitrov, who earlier had gone to Russia for medical treatment, died in Moscow. He was succeeded by Vassil Kolarov. | 4 |
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| Oct. 1 |
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| Bulgaria denounced its treaty of friendship with Yugoslavia. | 5 |
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