The article provides a description of four type collections of Mesozoic ostracods stored in the Federal Core Material Fund (FCMF) of the FGBU VNIGNI Aprelevka Branch of All-Russian Geological Oil Institute (Russia, Moscow region, с. Aprelevka). Two collections were gathered by M.I. Mandelstam and P.S. Lyubimova from the Callovian-Maastrichtian deposits of Western Siberia for a collective monograph (1960); the other two collections were gathered by N.N. Kolpenskaya from the Berriasian of the North Caucasus (2000), from Upper Jurassic deposits of the Pechora River basin and the eastern part of the Russian Platform for an article and two collective monographs (1993, 1995, 1997). Besides type specimens (holotypes and paratypes), the original specimens of all characteristic species encountered in the published works are stored. The collections comprise in total 337 specimens, including 82 holotypes, 35 paratypes, and 220 originals. The taxonomic lists are provided for the four collections, including references to the original description of each species, type locality, age, specimen number, status, and revision.