The United Nations High Commissioner for Refugees (UNHCR) was established in Geneva in 1951, when Resolution 428 (V) was adopted by the General Assembly of the UN, tasked with the legal and political protection of refugees. Due to the escalation of the armed conflict, the beginning of the war on the territory of former Yugoslavia and the large influx of refugees and exiles into Croatia, the UNHCR, responding to the appeal of the Croatian government, takes over, in December of 1991, the coordination of international operations regarding the refugees and exiles. The author of this paper analyzes, based on archival documents, periodicals, passed laws and adopted regulations, the activities of the UNHCR humanitarian mission in Croatia from 1991 to 1998. It shows the characteristics of the cooperation between the UNHCR and the Croatian government's Office for Refugees and Exiles, the Red Cross and various non-governmental organizations in matters of humanitarian aid delivery, special refugee-exile camp construction and through different work groups, which created the framework for humanitarian policy. On the example of the UNHCR's Daruvar office from July to December of 1992 and from January to October of 1995, a closer look at the issues of UNHCR fieldwork and their daily taks is provided.