The Charles H. Norton House, also known as Sharpenhoe, is a historic house at 132 Redstone Hill in Plainville, Connecticut. Built in 1922, this brick Georgian Revival house was the home of inventor and machinist Charles Hotchkiss Norton (1851–1942), a Plainville native, from 1922 until his death. The house was designated a National Historic Landmark in 1976 for its association with Norton, who designed heavy-duty precision grinding machines important for development of the automobile industry.