Newcastle is a village in the rural south west of Shropshire, England. It lies at the confluence of the River Clun and the Folly Brook, 3 miles west of the small town of Clun. The B4368 runs through the village, on its way between Craven Arms in Shropshire to Newtown in Powys.
The village has a community hall, a campsite (Clun Valley Camping), a church and a pub (the "Crown").
An association football club exists in the village, called Newcastle AFC or Newcastle Football Club, whose home ground is the Mill Field, situated to the southwest of the village between the B-road and the Folly Brook. They play in the Mid Wales South League.
Newcastle on Clun is a parish which covers the village and surrounding countryside, reaching the border with Wales to the north. It is part of the remote and very rural Clun Forest, part of the Shropshire Hills AONB. Offa's Dyke runs through the area. It forms part of the Clunelectoral division of Shropshire Council.