Twelve species of Leptobrachium are known from Vietnam, Laos and Cambodia, most of which have been described to science in the past twelve years. Our fieldwork on the Dakchung Plateau of southeastern Laos discovered a small Leptobrachium with a yellow upper iris that resembled L. buchardi, a species known only by the female holotype from the Bolaven Plateau of southern Laos. We use our new collections to expand the original description of L. buchardi, and describe the Dakchung species as new. Leptobrachium xanthops sp. nov. is distinguished from its congeners by having small body size (males with SVL 44.7, females with SVL 38.8-45.2), the upper one-half of iris and scleral arc pale yellow, a dark venter, and sexually active males without spines on the upper lip.