Baldersdale is a dale, or valley, on the east side of the Pennines in England, northwest of Barnard Castle.
Under provisions of the Local Government Act 1972, it was incorporated into County Durham for administrative purposes on 1 April 1974, along with the rest of the former Startforth Rural District.
A former railway viaduct from the now-closed Barnard Castle to Middleton-in-Teesdale line crosses the River Balder just west of Cotherstone.
There are various self-catering holiday cottages situated in the dale, including West Hury and East Briscoe.
Hannah Hauxwell, who became well known after an ITV documentary about her life in 1972 (Too Long A Winter), worked an inherited farm on her own in Baldersdale under very frugal conditions at Low Birk Hatt.