21, is a historic elementary school building located at Terre Haute, Vigo County, Indiana.

It was built in 1907–1908, and is a two-story, Classical Revival style brick building on a raised basement.

It features two-story pilasters, broken pediments, and round arches on the interior.

The building measures approximately 23,800 square feet.

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