Abstract: Six species of Chrysomelidae (Coleoptera) are recorded for the first time from Omsk Province: Oulema septentrionis (Weise, 1880), Cryptocephalus caerulescens C.R. Sahlberg, 1839, C. frenatus Laicharting, 1781, C. punctiger Paykull, 1799, Aphthona franzi Heikertinger, 1944, and Longitarsus kutscherai (Rye, 1872). Of these, O. septentrionis, A. franzi, and L. kutscherai are also recorded for the first time from West Siberia. Some notes on the host plants are given. © Pleiades Publishing, Ltd. 2023.