[in Russian with English abstract: ] Based on studies of lichenbiota of oak forests of Petrikovsky district (Gomel Region, Republic of Belarus), carried out in 2021 in 10 localities, an annotated list, including 100 species of lichens and 5 species – related fungi, was compiled. Lichen Coenogonium luteum is published for the first time for Belarus; 16 species are new for the Gomel Region. Calicium adspersum, Chaenotheca chlorella, Hypotrachyna revolutа and Parmotrema stuppeum are included in the Red Data Book of Belarus and are presented for the first time for the Petrikovsky district. The indicator lichens of old-growth forests include 18 species. In all surveyed 10 localities, 31 species were noted. Keywords: biological diversity, Coenogonium luteum, new finds, indicator species, oak forests.