Cascob (Welsh: Casgob) is a small village in Powys.
It is located in a valley five miles to the south-west of Knighton.
The village is situated to the east of Radnor Forest, an area of moorland just within Wales.
It also lies to the north-west of the small border town of Kington.
In 1086, when the Domesday Book was compiled, Cascob was listed with no recorded population but within the hundred of Leintwardine.