New names, synonymy, and two new species are proposed for the orchid flora of Indonesia. Thus Habenaria undatifolia and Odontochilus buruensis are proposed as replacement names; Dendrobium babiense is reduced to D. nycteridoglossum; Kalimantanorchis is found to be a synonym of Tropidia, requiring the combination T. nagamasui; Aerides zollingeri is transferred to Tuberolabium with Saccolabium odoratissimum as a new synonym; and two new species are proposed, namely, Dendrobium asahanense and Styloglossum morotaiense.