Vasil Petrov Kolarov (July 16 1877 January 23 1950) was a Bulgarian communist political leader.

Kolarov was born in Shumen , Bulgaria. In the 1890s he joined the Bulgarian Social Democratic Party, and by 1905 had identified himself with its Narrow (revolutionary) wing. He was elected to the Bulgarian national assembaly in 1913 and 1920. By this time Kolarov was among the leaders of the party, and was an active participant in the Comintern. In 1923 he led a communist uprising along with Georgi Dimitrov. The uprising failed and Kolarov fled to the Soviet Union where he remained for over 20 years.

Kolarov returned to Bulgaria in 1945 during its occupation by the Soviet Union, and was elected to its national assembaly again. He was reelected in 1946 and became provisional president of Bulgaria that year, amidst the growing domination of the communists. He remained president until 1947, and then became foreign minister in the Dimitrov government. When Dimitrov died in 1949, Kolarov lost his position as foreign minister and did not make a public appearance, but he was elected prime minister of Bulgari by the party. He served in that position until his death a few months later. He died in Sofia, Bulgaria.