Data on 17 species of lichenized and lichenicolous fungi from Belarus are presented, of which three lichens (Fuscidea pusilla, Protoparmelia hypotremella, and Ropalospora viridis) and 13 lichenicolous fungi (Abrothallus cladoniae, Acremonium lichenicola, Arthonia coronata, Epicladonia simplex, Intralichen lichenicola, Lichenochora obscuroides, Lichenoconium erodens, L. lecanorae, L. pyxidatae, Lichenosticta alcicornaria, Lichenostigma alpinum, Pyrenochaeta xanthoriae, and Syzygospora physciacearum) are new to the country. The facultatively lichenicolous fungus Taeniolina scripta is reported on lichens for the first time from Belarus. Key words: Biodiversity, distribution, lichenicolous hyphomycetes, sorediose lichens.