Nine species and one subspecies of mosses are reported new to Vietnam. They are Calymperes crassinerve (Mitt.) Jaeg., Calymperes erosum C. Muell., Calymperes motleyi Mitt., Calymperes subintegrum Broth., Fissidens crassinervis Sande Lac., Leucoloma mittenii Fleisch., Mitthyridium fasciculatum (Hook. & Grev.) Robins. subsp. obtusifolium (Lindb.) M. Menzel, Pelekium investe (Mitt.) Touw, Trachycarpidium echinatum Dix., and Weissia platystegia (Dix.) A. Eddy. The last two taxa are also new records for Continental SE Asia, previously known only from Papua New Guinea. Calymperes crassinerve is new to Indochina region.