Jaša Prodanović (Čačak, Principality of Serbia, 23 April 1867 – Belgrade, Yugoslavia, 1 June 1948) was a Serbian politician and writer. Most of his life he fought against totalitarianism but in his senior years, he joined the communists to usurp the Old Order. In 1945, he became deputy prime minister of Yugoslavia and held the post for three years until he died, endorsing the shift to totalitarian rule.