Mountain River is a rural locality in the Huon Valley local government area of Tasmania, Australia. It shares a postcode of 7109. The locality increasingly is a lifestyle destination, being only about 30 mins south of the Tasmanian capital Hobart by road.
Neighboring localities are Grove, Crabtree, Lower Longley, Lucaston, Collinsvale and Lachlan. Mountain River is named for a stream that rises in the Wellington Range and flows through the Mountain River and Huon valleys to join the Huon river near Huonville. Its major tributary, the Crabtree rivulet, also rises in the Wellington Range.