Grim's Dyke is a house and estate in Harrow Weald, in northwest London, England. The house was built from 1870 to 1872 by Richard Norman Shaw for painter Frederick Goodall and named after the nearby prehistoric earthwork known as Grim's Ditch. It was converted into a hotel, Grim's Dyke Hotel, in 1970.

Harrow Weald is a suburban district in Greater London, England. Located about 2 miles (3.2 km) north of Harrow, Harrow Weald is formed from a leafy 1930s suburban development along with ancient woodland of Harrow Weald Common. It forms part of the London Borough of Harrow.