Displaced persons camps in post–World War II Europe were established in Germany, Austria, and Italy, primarily for refugees from Eastern Europe and for the former inmates of the Nazi German concentration camps. A "displaced persons camp" is a temporary facility for displaced persons, whether refugees or internally displaced persons. Two years after the end of World War II in Europe, some 850,000 people lived in displaced persons camps across Europe, among them Armenians, Czechoslovaks, Estonians, Greeks, Bulgarians, Poles, Latvians, Lithuanians, Yugoslavs, Jews, Russians, Ukrainians, Hungarians, Kalmyks, and Belarusians.

At the end of the Second World War, at least 40 million people had been displaced from their home countries, with about eleven million in Allied-occupied Germany. Among those, there were around 1.2 million people who refused to return to their countries of origin. These included former prisoners of war, released slave laborers, and both non-Jewish and Jewish concentration-camp survivors. The Allies categorized the refugees as "displaced persons" (DPs) and assigned the responsibility for their care to the United Nations Relief and Rehabilitation Administration (UNRRA).

Combat operations, ethnic cleansing, and the fear of genocide uprooted millions of people from their homes over the course of World War II. Between 40 million and 60 million people were displaced. A large number were inmates of Nazi concentration camps, labor camps and prisoner-of-war camps that were freed by the Allied armies. In portions of Eastern Europe, both civilians and military personnel fled their home countries in fear of advancing Soviet armies, who were preceded by widespread reports of mass rape, pillaging, looting, and murder.

As the war ended, these people found themselves facing an uncertain future. Allied military and civilian authorities faced considerable challenges resettling them. Since the reasons for displacement varied considerably, the Supreme Headquarters Allied Expeditionary Force classified individuals into a number of categories: evacuees, war or political refugees, political prisoners, forced or voluntary workers, Organisation Todt workers, former forces under German command, deportees, intruded persons, extruded persons, civilian internees, ex-prisoners of war, and stateless persons.

In addition, displaced persons came from every country that had been invaded or occupied by German forces. Although the situation of many of the DPs could be resolved by simply moving them to their original homes, this could not be done, for example, where borders changed to place the location in a new country. Additionally, many could not return home for fear of political persecution or retribution for perceived (or actual) collaboration with Axis powers.

The original plan for those displaced as a result of World War II was to repatriate them to their countries of origin as quickly as possible. Throughout Austria and Germany, American, French, British, or Soviet forces tended to the immediate needs of the refugees located within their particular Allied Occupation Zone and set in motion repatriation plans.

Nearly all of the displaced persons were malnourished, a great number were ill, and some were dying. Shelter was often improvised, and there were many instances of military personnel sharing from their own supplies of food, medicine, clothing, etc. to help the refugees.

Initially, military missions of the various Allied nations attached to the British, French and U.S. army commands assisted in the sorting and classifying the DPs of their own nationality. For example, during 1945 and 1946 there were several dozen Polish liaison officers attached to individual occupation army units. On October 1, 1945, the United Nations Relief and Rehabilitation Administration (UNRRA), which had already been running many of the camps, took responsibility for the administration of displaced persons in Europe, though military authorities continued to play a role for several years to come, in providing transportation, supplies and security.