Grim's Dyke (sometimes called Graeme's Dyke until late 1891) is the name of a house and estate located in Harrow Weald, in northwest London, England, built from 1870 to 1872 by Richard Norman Shaw, and named after the nearby pre-historic earthwork known as Grim's Ditch. The house is best known as the home of dramatist W.S. Gilbert, who lived there for the last two decades of his life. He died while attempting to save a girl from drowning in his lake.