Menabilly (, meaning stone of colts) is an historic estate on the south coast of Cornwall, England, situated within the parish of Tywardreath on the Gribben peninsula about west of Fowey.
It has been the seat of the Rashleigh family from the 16th century to the present day. The mansion house, which received a Grade II* listing on 13 March 1951, is early Georgian in style, having been re-built on the site of an earlier Elizabethan house, parts of which were possibly incorporated into the present structure. The house is surrounded by woodland and nearby is the farmhouse Menabilly Barton. In the Return of Owners of Land, 1873 Jonathan Rashleigh of Menabilly, Par, was listed as the largest landowner in Cornwall with an estate of or almost 4% of the total area of Cornwall.