Castleton is a village in the High Peak district of Derbyshire, England, at the western end of the Hope Valley on the Peakshole Water, a tributary of the River Noe, between the Dark Peak to the north and the White Peak to the south. The population was 642 at the 2011 Census.

High Peak is a local government district with borough status in Derbyshire, England, covering a high moorland plateau in the Dark Peak area of the Peak District National Park. The district stretches from Holme Moss in the north to Sterndale Moor in the south, and from Hague Bar in the west to Bamford in the east. The population of the borough taken at the 2011 Census was 90,892. The borough is unusual in having two administrative centres for its council, High Peak Borough Council; the offices are in Buxton and Glossop. Other towns include Chapel-en-le-Frith, Hadfield, New Mills and Whaley Bridge.