The Fiordland skink, Oligosoma acrinasum, is a species of skink endemic to the Fiordland temperate forests ecoregion of South Island, New Zealand. The Fiordland skink is found on one mainland locations and the exposed rocky shores of numerous islands along the Fiordland coast. Their distribution has declined due to introduced predators. Currently it lives only on foreshore rocks and boulder beaches on the Fiordland coast. It is abundant, even extremely abundant, in areas free from mammalian predators, but it barely survives where predators are present.