The Wallace-Jagdfeld Octagon House built in 1860 is an historic octagonal house located at 171 Forest Avenue in Fond du Lac, Wisconsin. The two-story home features clapboard siding, a front porch, and a central chimney. On April 26, 2002, it was added to the National Register of Historic Places, becoming the second octagon house in Fond du Lac on the National Register. It is located across the street from two other listings on the National Register, Hotel Calumet and the Chicago and Northwestern Railroad Depot.