Abstract: The aim of the study was to obtain knowledge on the moss flora of the Giresun Region-rather than to identify the entire range moss flora of the region. After the identification of 287 moss specimens collected from the research area between June and August in 2007 and 2008, total 85 taxa were defined. These taxa belong to 17 families and 37 genera of Bryopsida (Musci). Among them, 14 taxa -Hygroamblystegium irriguum Hedw., Rhynchostegium confertum (Dicks.) B. S. G., Rhynchostegium alpinum Huds. ex With., Bryum dichotomum Hedw., Bryum laevifilum Syed., Hygrohypnum smithii (Sw.) Broth., Grimmia decipiens (Schultz) Lindb., Grimmia tergestina Tomm. Ex Bruch and Schimp., Schistidium flaccidum (DeNot.) Ochyra., Schistidium platyphyllum (Mitt.) Kindb., Palustriella decipens (De Not.) Ochyra., Desmatodon latifolius (Hedw.) Brid., Phascum curvicolle Hedw., Syntrichia princeps (De Not.) Mitt. new for A4 grid square (40°- 42` N, 38°- 42` E) which was adopted by Henderson. Thirty six taxa are new for Giresun Province. All taxa are new for study area. For every each taxon, the habitat pattern and distribution data are presented.