Mathinna is a rural locality in the local government areas (LGA) of Break O'Day (97%) and Dorset (3%) in the North-east LGA region of Tasmania. The locality is about 83 kilometres (52 mi) south-west of the town of St Helens. The 2016 census recorded a population of 142 for the state suburb of Mathinna. It is a small Australian town in the north-east of Tasmania, 63 km east of Launceston. It was named after a young Aboriginal girl sent to live with the Lieutenant Governor of Van Diemen's Land, Sir John Franklin and his wife, Lady Jane Franklin.