Duplex is an unincorporated community in Williamson County, in the U.S. state of Tennessee.

[1] It is the location of, or nearest community to, at least two historic sites that are or once were listed on the National Register of Historic Places: the Thompson Store and Maplewood Farm.

[2] The community itself was described as a crossroads community in a 1988 study of historic resources in the county.

However, it was deemed not being worthy of listing on the National Register as a historic district, because too many of its older structures had been demolished and replaced.

This Williamson County, Tennessee geography–related article is a stub.