The Castle Crag, also known as the Falling Mountain, is a mountain in the Central Highlands region of Tasmania, Australia. The mountain is part of the Du Cane Range and is situated within the Cradle Mountain-Lake St Clair National Park. The mountain is a major feature of the national park and is a popular venue with bush walkers and mountain climbers.
With an elevation of above sea level, the mountain is the twentieth highest mountain in Tasmania.