The Wientjes Barn and Ranch Yard are a historic farm property in rural Campbell County, South Dakota.

It consists of a barn and ranch yard located amid other farm buildings near the junction of 299th Avenue and 117th Street, west-southwest of Mound City.

The barn, built in 1909, is a large wood-frame structure with a gambrel roof and integral shed extensions on the long sides, bringing the structure to a shape that is 64 feet (20 m) square.

[2] The ranch yard and barn were listed on the National Register of Historic Places in 2013.

This article about a property in South Dakota on the National Register of Historic Places is a stub.