Presteigne is a town and community in Radnorshire, Powys, Wales on the south bank of the River Lugg. Formerly the county town of the historic county of Radnorshire, the town has, in common with several other towns close to the Wales-England border, assumed the motto, "Gateway to Wales". The border wraps around three sides of the town. Nearby towns are Kington, Herefordshire to the south and Knighton to the north, and surrounding villages include Norton and Stapleton. The town falls within the Diocese of Hereford. The community has a population of 2,710; the built-up area had a population of 2,056.

Until 1974, Radnorshire was an administrative county in mid Wales, later classed as one of the thirteen historic counties of Wales. It covered a sparsely populated area, and was bounded to the north by Montgomeryshire and Shropshire, to the east by Herefordshire, to the south by Brecknockshire and to the west by Cardiganshire.