Trewern Hall or Trewern Farmhouse is a country house in Montgomeryshire, Wales, close to the Shropshire border. It is on a spur in the floodplain of the River Severn, in the Trewern community area of what is now Powys, to the north of the A458 road from Shrewsbury to Welshpool. It is a fine example of a Severn valley half-timbered house. The Grade II* listed hall was occupied by the Lloyd, Francis and Whittaker families. In 1985–86 and 1993–94 it was extensively restored with some remodelling by the architect M. J. Garner for Murray Ll. Chapman.