Richards Mansion, also known as The Mansion House, is a historic mansion located at Georgetown, Sussex County, Delaware. The oldest section was built between 1796 and 1799, and is a two-story, four-bay, single pile Federal style structure that is now the rear wing. The main house was built between 1835 and 1845, and is a three-story, five-bay, frame structure in the Greek Revival style. The third floor was added in 1883, with the addition of a mansard roof in the Second Empire style.

The site was added to the National Register of Historic Places in 1979.