During an investigation on mosses of some underexplored regions of Nagaland, 121 taxa of mosses belonging to 74 genera and 29 families have been identified. Atrichum crispulum Schimp. & Besch. and Plagiothecium neckeroideum var. niitakayamae (Toyama) Z. Iwats. are new records for India. Five taxa namely Fissidens crassinervis var. laxus (Sull & Lesq.) A. Eddy., Barbula inaequalifolia Taylor, Amblystegium saxatile Schimp., Dicranum orthophylloides Dixon and Fabronia madurensis Dixon & Vard. are reported for the first time from Eastern Himalaya, while 57 taxa are new additions to Nagaland.