Mile Budak (30 August 1889 – 7 June 1945) was a Croatian politician and writer best known as one of the chief ideologists of the Croatian fascist Ustaša movement, which ruled the Independent State of Croatia during World War II in Yugoslavia from 1941–45 and waged a genocidal campaign of extermination against its Roma and Jewish population, and of extermination, expulsion and religious conversion against its Serb population.