Fortsville is a historic home located near Grizzard, Sussex County, Virginia.

Its present form consists of a two-story, three-bay, front-gabled central section flanked by one-story, two-bay wings, with a center section extension completed in 1792.

The frame dwelling is set on a brick foundation.

Fortsville was the home of statesman John Y. Mason (1799–1859).

This article about a property in Sussex County, Virginia on the National Register of Historic Places is a stub.