Murdunna is a rural locality in the local government area (LGA) of Tasman in the South-east LGA region of Tasmania. The locality is about 36 kilometres (22 mi) north-east of the town of Nubeena. The 2016 census recorded a population of 309 for the state suburb of Murdunna. It is a small town at the head of King George Sound, a narrow bay opening off Norfolk Bay. Murdunna is approximately halfway down the Forestier Peninsula on the Arthur Highway to Port Arthur. It is around 6 metres above sea level.