Collections of the Museum – Memorial Site in Bełżec include several thousand items received from the Council for the Protection of the Memory of Struggle and Martyrdom Sites in Warsaw, the State Museum at Majdanek in Lublin, the Janusz Peter Regional Museum in Tomaszów Lubelski, and from the United States Holocaust Memorial Museum in Washington.
Most of the artifacts were found during the archaeological research conducted on the grounds of the former death camp. The research was carried out by a group of archaeologists from the Nicolaus Copernicus University in Toruń led by prof. dr hab. Andrzej Kola. The permanent exhibition shows some of post-camp relics, but, due to both a limited space and a nature of the exhibition, these constitute only a small part of the museum collections. Some of the artifacts, which have not been included in the exhibition, are presented above.