Annandale National Historic Site is a National Historic Site of Canada located in Tillsonburg, Ontario, Canada. It was built in 1880 by Edwin Delevan Tillson (Tillsonburg's first mayor, son of the founder of Tillsonburg, George Tillson), and his wife Mary Ann as part of Mr. Tillson's retirement project, Annandale Farm. The Tillsons moved into the house in 1883. The interior of Annandale House is a living monument to the Victorian style of design, known as the "Aesthetic Art Movement." The site was designated as a National Historic Site in 1997 for its interior decor.