A new species of diplodactylid gecko, Bavayia nubila Bauer, Sadlier, Jackman & Shea, n. sp., is described from forests at two sites in the drainage of the Tontouta Valley in the ultramafic ranges of southeastern New Caledonia. The new gecko is the sister species of the much smaller Bavayia goroensis; both species are basal within the B. cyclura clade. The area from which the species is recorded so far is the focus of extensive nickel mining operations, and because of its restricted distribution and the potential threats posed by mining in the region, it is here regarded as Endangered under IUCN red list criteria.