Dunham Massey Hall, usually known simply as Dunham Massey, is an English country house in the parish of Dunham Massey in the district of Trafford, near Altrincham, Greater Manchester. During World War I it was temporarily used as the Stamford Military Hospital. It was designated a Grade I listed building on 5 March 1959. It has been owned by the National Trust since the death of Roger Grey, 10th and last Earl of Stamford in 1976.