The Highbank Park Works (also known as the Orange Township Works) is a complex of earthworks and a potential archaeological site located within Highbanks Metro Park in the central part of the U.S. state of Ohio. The park is in southernmost Delaware County on the east bank of the Olentangy River. The site is a semi-elliptical embankment, consisting of four sections, each 3 feet (0.91 m) high, and bordered by a shallow ditch. It is thought to have been constructed sometime between 800 and 1300 CE by members of the Cole culture. The earthworks have seen little disturbance since the first white settlement of the region; agriculture has never been practiced on their vicinity, and no significant excavation has ever been conducted at the site. One small excavation and field survey, conducted in 1951, yielded a few pieces of pottery and flakes of flint from a small midden.
The Highbank Park Works is one of several wall-and-ditch earthworks in central Ohio. Unlike Highbank, most of these complexes are known to be the work of people of the Hopewell tradition; however, the similarity between the works of the Hopewell and Cole peoples has led archaeologists to propose that the Cole were descended from the Hopewell.
Also located in Highbank Park are two subconical Adena era mounds. These two mounds are known as the Highbanks Park Mound I (also known as the Muma Mound) and Highbanks Park Mound II (also known as the Orchard Mound or the Selvey Mound). The two mounds are not located within the embankment, but are about 0.5 and 1 mile away.
In 1974, the Highbank Park Works were listed on the National Register of Historic Places because of their archaeological significance. Three other Delaware County archaeological sites are listed on the Register: the Ufferman Site, the site of a former Cole village; the Highbanks Park Mounds, and the Adena Spruce Run Earthworks.