The paper presents the results of a study on the tenebrionid beetles (more than 10,500 specimens belonging to 78 species) collected in Poland and preserved in the following national zoological collections: Institute of Systematics and Evolution of Animals PAS, Cracow (ISEA), Museum and Institute of Zoology PAS, Warsaw (MIZ) and Upper Silesian Museum, Bytom (USMB). The occurrence of 14 rarely recorded species is confirmed. The presence of 14 studied species on the „Polish Red List of Endangered Animals” and „Polish Red Data Book of Animals” is recorded. The common species, Isomira murina (L.), as a senior synonym of I. semiflava (KUST.), should be excluded from the „Polish Red List of Endangered Animals”. Two species should be excluded from Polish fauna because of an erroneous determination: Pedi- nus helopioides AHR. as Crypticus quisquilius (L.), and Isomira icteropa (KUST.) as Isomira murina (L.). New distributional data on the occurrence on Catalogus faunae Poloniae regions is given for 44 species. Centorus elongatus (HERBST), Cryphaeus cornutus (FISH.) and Nalassus convexus (COM.) are recorded from Poland, but not included in Polish fauna.