Dataset contains up-to-date information on the occurrence of Lepidoptera in the Mordovia State Nature Reserve (Russian Federation). The dataset is based on our own research, which was conducted in 2007 - 2021 (we also studied and indicated materials from previous years). The dataset consists of 7,606 occurrences records, 7,473 of which are determined up to species, 133 to the genus. All of them have geographic coordinates and belonging to 61 families.