Military history of Bulgaria during World War II

The military history of Bulgaria during World War II encompasses an initial period of neutrality until 1 March 1941, a period of alliance with the Axis Powers until 9 September 1944 (on 8 September, the Red Army entered Bulgaria) and a period of alignment with the Allies in the final year of the war. Bulgaria functioned as a constitutional monarchy during most of World War II. Tsar Boris III (reigned 1918–1943) ruled with a Prime Minister and a Parliament.

The government of the Kingdom of Bulgaria under Prime Minister Georgi Kyoseivanov declared a position of neutrality upon the outbreak of World War II. Bulgaria was determined to observe it until the end of the war; but it hoped for bloodless territorial gains in order to recover the territories lost in the Second Balkan War and World War I, as well as gain other lands with a significant Bulgarian population occupied by neighboring countries. However, it was clear that the central geopolitical position of Bulgaria in the Balkans would inevitably lead to strong external pressure by both World War II factions. Turkey had a non-aggression pact with Bulgaria. On 7 September 1940, Bulgaria succeeded in negotiating the recovery of Southern Dobruja in the Axis-sponsored Treaty of Craiova (see Second Vienna Award). Southern Dobruja had been part of Romania since 1913. This recovery of territory reinforced Bulgarian hopes for resolving other territorial problems without direct involvement in the War.

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