147 lichen species are reported from 21 collecting sites in Giresun province of Turkey. Cladonia deformis (L.) Hoffm. is new to Turkey. For each taxon, habitat and distributional data are provided 67 species are new to the province of Giresun. 8 species were defined for the first time for the eastern Black Sea region. A comparison is made with the lichen flora of the other Turkish Eastern Black Sea and adjacent Eastern Anatolian Provinces.