Tredethy is a house and estate in the civil parish of St Mabyn, Cornwall, UK, at Grid reference SX 06 71. It occupies seven acres and is one of a number of small manor houses in the parish all built in the 16th and 17th centuries. The house was extensively restored in 1892 by the prominent Cornish architect Silvanus Trevail.^[1]

This was the seat of the Rev. Charles Peters (1690–1774), a Hebrew scholar.^[2]

Later it became the home of Prince Chula Chakrabongse of Thailand who married Elizabeth Hunter, an English woman in 1938. Their daughter, Mom Rajawongse Narisa Chakrabhongse, was born in 1956.^{[3] [4]} They lived at Tredethy in the 1940s and 1950s.^[5] At Bodmin there is an ornate granite drinking bowl which serves the needs of thirsty dogs at the entrance to Bodmin's Priory car park which was donated by Prince Chula.^[6] There is a similar granite drinking bowl at Mitchem’s Corner in Cambridge, donated in 1934 in memory of Prince Chula’s dog called Tony.

In the 1960s Tredethy was converted to a hotel with 11 en-suite bedrooms.^[7]