Selwyn is a historic home located near Mechanicsville, Hanover County, Virginia. It was built about 1820 and expanded in the 1850s. It is a large 2 1/2-story, five bay, frame I-house dwelling in a combination of the Federal and Greek Revival styles. The house sits on a brick foundation, has a gable roof with dormers, and exterior end chimneys. Also on the property is a contributing frame dairy.