Stanisław Mikołajczyk was a Polish politician. He was a Prime Minister of the Polish government-in-exile during World War II, and later Deputy Prime Minister in post-war Poland until 1947.

The Polish government-in-exile, officially known as the Government of the Republic of Poland in exile, was the government in exile of Poland formed in the aftermath of the Invasion of Poland of September 1939, and the subsequent occupation of Poland by Germany, the Soviet Union, and the Slovak Republic, which brought to an end the Second Polish Republic.