Newtown is a town in Powys, Wales. It lies on the River Severn in the community of Newtown and Llanllwchaiarn, within the historic boundaries of Montgomeryshire. It was designated a new town in 1967 and saw population growth as firms settled, changing its market town character. Its 2001 population of 10,780 rose to 11,357 in the 2011 census, and rose again to 11,362 in the 2021 census.

Until 1974, Montgomeryshire was an administrative county in mid Wales, later classed as one of the thirteen historic counties of Wales. It was named after its county town, Montgomery, which in turn was named after one of William the Conqueror's main counsellors, Roger de Montgomerie, who was the 1st Earl of Shrewsbury.