The Harry E. Donnell House, also known as The Hill, is a historic 33-room Tudor Revival mansion located on the north shore of Long Island, at 71 Locust Lane, Eatons Neck, Suffolk County, New York. The mansion was designed by New York City architect Harry E. Donnell for his wife, Ruth Robinson Donnell on 200 acres (81 ha) of land given to the couple by Ruth's father George H. Robinson. The mansion was constructed in June, 1902 and completed in January, 1903 by the Randall and Miller Company of Freeport, New York. When completed, the mansion had dual waterfronts. The east lawn extended from the mansion to Duck Island Harbor, and had sweeping views of Long Island Sound, while the south lawn extended to Northport Bay. About 80 acres (32 ha) northwest of the mansion was fashioned into a golf course.