Sobibor (, Polish: [sbibur]) was an extermination camp built and operated by Nazi Germany as part of Operation Reinhard. It was located in the forest near the village of Sobibr in the General Government region of German-occupied Poland.

As an extermination camp rather than a concentration camp, Sobibor existed for the sole purpose of murdering Jews. The vast majority of prisoners were gassed within hours of arrival. Those not killed immediately were forced to assist in the operation of the camp, and few survived more than a few months. In total, some 170,000 to 250,000 people were murdered at Sobibor, making it the fourth-deadliest Nazi camp after Belzec, Treblinka, and Auschwitz.

The camp ceased operations after a prisoner revolt which took place on 14 October 1943. The plan for the revolt involved two phases. In the first phase, teams of prisoners were to discreetly assassinate each of the SS officers. In the second phase, all 600 prisoners would assemble for evening roll call and walk to freedom out the front gate. However, the plan was disrupted after only 12 SS men had been killed. The prisoners had to escape by climbing over barbed wire fences and running through a mine field under heavy machine gun fire. About 300 prisoners made it out of the camp, of whom 58 are known to have survived the war.

After the revolt, the Nazis demolished the camp and planted it over with pine trees. The site was neglected in the first decades after World War II, and the camp had little presence in either popular or scholarly accounts of the Holocaust. It became better known after it was portrayed in the TV miniseries Holocaust (1978) and the film Escape from Sobibor (1987). The Sobibor Museum now stands at the site, which continues to be investigated by archaeologists. Photographs of the camp in operation were published in 2020 as part of the Sobibor perpetrator album.

The Holocaust in Poland was part of the European-wide Holocaust organized by Nazi Germany and took place in German-occupied Poland. During the genocide, three million Polish Jews were murdered, half of all Jews murdered during the Holocaust.

The Holocaust in Poland was marked by the construction of death camps by Nazi Germany, German use of gas vans, and mass shootings by German troops and their Ukrainian and Lithuanian auxiliaries. The extermination camps played a central role in the extermination both of Polish Jews, and of Jews whom Germany transported to their deaths from western and southern Europe.

Every branch of the sophisticated German bureaucracy was involved in the killing process, from the interior and finance ministries to German firms and state-run railroads. Approximately 98 percent of Jewish population of Nazi-occupied Poland during the Holocaust were killed. About 350,000 Polish Jews survived the war; most survivors never lived in Nazi-occupied Poland, but lived in the Soviet-occupied zone of Poland during 1939 and 1940, and fled or were evacuated by the Soviets further east to avoid the German advance in 1941.

Of over 3,000,000 Polish Jews deported to Nazi concentration camps, only about 50,000 survived.