Gov. William H. Ross House, also known as The Ross Mansion, is a historic home located near Seaford, Sussex County, Delaware. It was built in 1859, and is a two-story, brick mansion in three main connected blocks in an "H"-shape. It is in the Italianate style and features a three-story tower in the central space. The interior retains its original plaster mouldings, its Victorian trim, doors, and original inside shutters. It was the home of Delaware Governor William H. H. Ross (1814-1887), who built the home along the railroad he helped to establish.