Taisto Kalevi Sorsa (21 December 1930 – 16 January 2004) was a Finnish politician. He was Prime Minister of Finland three times: 1972–1975, 1977–1979 and 1982–1987. At the time of his death he still held the record for most days of incumbency as prime minister. He was also a long-time leader of the Social Democratic Party of Finland.