The Treasurer's House is a National Trust-owned property in Martock, in the English county of Somerset.

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.

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.

[2] In 1297 John Langton, who was a chancellor of England and Bishop of Chichester, received the Great Seal of the Realm which was stored at the "court at Martock".

In 1943 it was bought by Harold St George Gray, the librarian-curator of the Museum for the Somerset Archaeological and Natural History Society to preserve it.

[9] The building has a T-shaped plan, with the west projecting wing being a hall added in the late 13th century.