Jasenovac concentration camp in the context of "Extermination camp"

The Independent State of Croatia (Croatian: Nezavisna Država Hrvatska, NDH) was a World War II–era quasi-protectorate of Fascist Italy (1941–1943) and puppet state of Nazi Germany (1941–1945). It was established in parts of occupied Yugoslavia on 10 April 1941, after the invasion by the Axis powers. Its territory consisted mostly of modern-day Croatia and Bosnia and Herzegovina, as well as some parts of modern-day Serbia and Slovenia, but also excluded many Croat-populated areas in Dalmatia (until late 1943), Istria, and Međimurje regions (which today are part of Croatia).

During its entire existence, the NDH was governed as a one-party state by the fascist Ustaše organization. The Ustaše was led by its Poglavnik, Ante Pavelić. The regime targeted Serbs, Jews and Roma as part of a large-scale campaign of genocide, as well as anti-fascist or dissident Croats and Bosnian Muslims. According to Stanley G. Payne, "crimes in the NDH were proportionately surpassed only by Nazi Germany, the Khmer Rouge in Cambodia and several of the extremely genocidal African regimes." In the territory controlled by the NDH, between 1941 and 1945, there existed 22 concentration camps. The largest camp was Jasenovac. Two camps, Jastrebarsko and Sisak, held only children.

The Sisak concentration camp was a concentration and transit camp located in the town of Sisak, in the Axis puppet state the Independent State of Croatia (NDH), from 1941 to 1945, during World War II. It consisted of two sub-camps, Sisak I and Sisak II. The former was used to intern adults destined for forced labour in the Reich and was established in 1941, while the latter was used to detain unaccompanied Serb—and to a lesser extent, Jewish and Roma—children who had been separated from their parents over the course of the conflict. Sisak I was operated by the Germans, whereas Sisak II was administered by the Ustaše, with some German gendarmes guarding its perimeter. The latter became operational in July–August 1942, receiving a group of children who had previously been detained at Mlaka.

Living conditions at the children's camp were poor, leading to a high mortality rate. According to survivors, some children were killed by being given poisoned milk or gruel laced with caustic soda. On other occasions, camp commander Antun Najžer administered children with lethal injections. Thousands of children were saved from the camp as a result of rescue efforts spearheaded by the humanitarian Diana Budisavljević and the local communist underground. Sisak II was dissolved in January 1943. The exact number of children who perished there is unknown, but estimates range from 1,160 to 1,600, largely as a result of starvation, thirst, typhus and neglect. In April 1944, the Germans ceded control of Sisak I to the Ustaše. It was shut down in January 1945 and its remaining inmates were dispatched to Jasenovac.

Jasenovac (pronounced [jasěnoʋat͡s]) is a village and a municipality in Croatia, in the southern part of the Sisak-Moslavina County at the confluence of the river Una into Sava. In Croatian "jasen" means ash tree and the name Jasenovac means "ashen, or made of ash tree".

Jasenovac attained notoriety during the Holocaust through the Jasenovac concentration camp giving its name to the Ustaše complex of WWII concentration camps in the context of the Genocide of Serbs.

The Holocaust saw the genocide of Jews within the Independent State of Croatia (Croatian: Nezavisna Država Hrvatska, NDH), a fascist puppet state that existed during World War II, led by the Ustaše regime, which ruled an occupied area of Yugoslavia including most of the territory of modern-day Croatia, the whole of modern-day Bosnia and Herzegovina and the eastern part of Syrmia (Serbia). Of the 39,000 Jews who lived in the NDH in 1941, the United States Holocaust Memorial Museum states that more than 30,000 were murdered. Of these, 6,200 were shipped to Nazi Germany and the rest of them were murdered in the NDH, the vast majority in Croatian Ustaše-run concentration camps, such as Jasenovac. The Ustaše were the only quisling forces in Yugoslavia who operated their own extermination camps for the purpose of murdering Jews and members of other ethnic groups.

Of the minority, 9,000 Jews, who managed to survive, 50% of them did so by joining the Partisans or escaping to Partisan-controlled territory. The Partisans welcomed 10 Yugoslav Jews who were named National Heroes, the highest WWII award, including Jews from Croatia. Croatian civilians were also involved in saving Jews during this period. As of 2024, 133 Croats have been recognized as Righteous among the Nations.