The Treasurer's House is a National Trust-owned property in Martock, in the English county of Somerset. It has been designated as a Grade I listed building. Apart from the Bishop's Palace, Wells it is the oldest house in the county.

The original 13th-century buildings have been added to several times, including a 15th-century great hall which has an arch-braced-collar truss roof. Several of the rooms have wall paintings which have been uncovered and restored since the National Trust were given the building in 1970. The house belonged to the Bishop of Bath and Wells and at one time was used to store the Great Seal of the Realm when John Langton was the chancellor of England.