The Genocide of Serbs in the Independent State of Croatia (Serbo-Croatian: Genocid nad Srbima u Nezavisnoj Državi Hrvatskoj / Геноцид над Србима у Независној Држави Хрватској) was the systematic persecution and extermination of Serbs committed during World War II by the fascist Ustaše regime in the Nazi German puppet state known as the Independent State of Croatia (Serbo-Croatian: Nezavisna Država Hrvatska / Независна Држава Хрватска, NDH) between 1941 and 1945. It was carried out through executions in death camps, as well as through mass murder, ethnic cleansing, deportations, forced conversions, and war rape. This genocide was simultaneously carried out with the Holocaust in the NDH as well as the genocide of Roma, by combining Nazi racial policies with the ultimate goal of creating an ethnically pure Greater Croatia.
The ideological foundation of the Ustaše movement reaches back to the 19th century. Several Croatian nationalists and intellectuals established theories about Serbs as an inferior race. The World War I legacy, as well as the opposition of a group of nationalists to the unification into a common state of South Slavs, influenced ethnic tensions in the newly formed Kingdom of Serbs, Croats and Slovenes (since 1929 Kingdom of Yugoslavia). The 6 January Dictatorship and the later anti-Croat policies of the Serb-dominated Yugoslav government in the 1920s and 1930s fueled the rise of nationalist and far-right movements. This culminated in the rise of the Ustaše, an ultranationalist, terrorist organization, founded by Ante Pavelić. The movement was financially and ideologically supported by Benito Mussolini, and it was also involved in the assassination of King Alexander I.
