New data on the occurrence of some rare species of crabronid digger wasps (Hymenoptera: Crabronidae) in Poland.The paper presents information on the occurrence of 15 species of crabronid digger wasps rarely recordedin Poland. The study is based on material collected mainly in Sandomierz Lowland in 1997-2013 as wellas specimens collected in 1896-1956 in various regions of the country and preserved in the entomologicalcollection of the Museum and Institute of Zoology of the Polish Academy of Sciences in Warsaw. Newlocalities for Ammoplanus hofferi Šnoflák, Crossocerus denticoxa (Bischoff), and Ectemnius schlettereri(Kohl, 1888) known so far from single records in Poland are presented. Literature data on the distribution ofCerceris albofasciata (Rossi, 1790) and Cerceris sabulosa (Panzer, 1799) are discussed. Some specimenspublished as Crabro (Solenius) larvatus Wesm. by A.R. Paul in 1941 are corrected to Ectemnius confinis(Walker, 1871) because of wrong determination. The threat categories for the listed species are discussed.