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.

[2] Later it became the home of Prince Chula Chakrabongse of Thailand who married Elizabeth Hunter, an English woman in 1938.

[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.