Belsay Hall is a 19th century country mansion located at Belsay, Northumberland. It is a Grade I listed building. The house was built between 1810 and 1817 for Sir Charles Monck to a design by architect John Dobson. It is built in ashlar with a Lakeland slate roof in the Greek Doric style.
The house measures 100 feet (30 m) square with a lower kitchen wing attached to the north side. Externally the house appears to have two stories,although there is an additional storey hidden within the roof space to house servants etc.
This service side of the house was badly affected by dry rot in the 1970s and, following remedial work, it has been left as a weather-proof shell to illustrate how the house was built. The hall was the residence of the Middleton family until 1962.