Nantcribba is a township in the parish of Forden in the historic county of Montgomeryshire and now in Powys It is also the site of Nantcribba Castle which was built by the Corbett, Barons of Caus, of Caus Castle in Shropshire. To the south of the Castle site was Nantcribba Hall, which was owned by the Devereux family and the Marquises of Hereford. In the 19th century Nantcribba became part of the Leighton Hall estates.

Townships in Montgomeryshire are divisions of the ancient parishes of the county of Montgomery. In 1539 townships were grouped together in Hundreds. The Townships which were recognised were based on the older Welsh divisions of Tref, or plural Trefi, which had formed the Welsh administrative districts of the Commote. Not all of the former Tref were recognised and some smaller trefi were amalgamated into larger townships. A township was allocated to a particular parish—that is, one of the [civil] parishes of Wales, the predecessors to today's communities of Wales. The townships were recognised as administrative districts, rather than the parishes.