Abstract
New data on the Lepidoptera fauna of Northern Kazakhstan are presented based on materials collected during the 2025 field season. Field surveys were conducted in several districts of the region (Tayynsha, Akkayin, Esil, Shal akyn, and Aiyrtau districts). As a result of the study, 250 species of Lepidoptera belonging to 27 families were recorded. Forty-five species are reported for the first time from the studied territory. The obtained data supplement previously published information on the Lepidoptera fauna of Northern Kazakhstan and indicate that the region remains insufficiently studied.