A new species of Hipposideros belonging to the H. pratti group is described. The species has been identified from a fairly restricted area in central Lao PDR and adjacent Vietnam, in South East Asia. The species is a large leaf-nosed bat, mid-way in size between the two other species known from the group, H. lylei and H. pratti, and its skull is significantly different in shape compared to the other two species. The new species roosts at least partially in caves in areas of degraded mixed deciduous and semi-evergreen forest as well as in areas of undisturbed semi-evergreen forest. The known distribution of all three species appears be allopatric, however, many areas within the region remain to be surveyed and so subsequent survey work may show the species to be sympatric.