Chettle House is a Grade I listed country house in Chettle, North Dorset, England, about 6 miles (10 km) northeast of the town of Blandford Forum. It was built in 1710 for George Chafin, to designs of the architect Thomas Archer.The house was bought by the banker William Castleman in 1846, who together with his solicitor son Charles Castleman built the first railway into Dorset in 1845–47 (the Southampton and Dorchester Railway, which was known as "Castleman's Corkscrew" because of its convoluted route).