Castell Malgwyn (alternatively Castle Malgwyn or Hammet House) is a grade II listed Georgian-style country house standing in a landscaped estate in the community of Manordeifi, Pembrokeshire, lying on the south bank of the river Teifi opposite the village of Llechryd. The gardens are listed at Grade II* on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales. The house is now an upmarket B&B.[1]