Great Nash was an important gentry house at Llangwm, Pembrokeshire, Wales.
An heiress married Alban Philipps, a younger son of the Picton Castle family, and by 1670 it was occupied by one of the Corbetts of Ynysmaengwyn, Merionethshire.
Dorothy Corbett married a son of Sir Hugh Owen, 2nd Bt MP of Orielton, Pembrokeshire before 1704.
It was described by Fenton as having been fashionable for its date, a sort of cube.
The remaining dovecote, of uncertain date but possibly late medieval or 16th Century, is a listed building.