Ogden-Fettie Site, Archaeological mound site in Lewistown, United States.

The Ogden-Fettie Site is a prehistoric mound complex south of Lewistown in Fulton County, Illinois. It consists of thirty-five mounds arranged in a crescent-shaped enclosure, with the principal mound near the center standing 15 feet (4.6 m) high. A village site beside the principal mound and four smaller mounds form a pentagonal enclosure.

The Ogden-Fettie Site was built during the Woodland period by people of the Havana Hopewell culture, dating from roughly 100 BCE to 400 CE. It was added to the National Register of Historic Places on July 31, 1972.

The site lies south of Lewistown in Fulton County, Illinois, within the Havana Hopewell region. Its crescent-shaped arrangement of thirty-five mounds and the pentagonal enclosure formed by four smaller mounds and a village area are the only known examples of such enclosures west of Ohio. The site was added to the National Register of Historic Places on July 31, 1972.

The site is located south of Lewistown in Fulton County, Illinois and can be explored on foot since the mound complex sits in open land and is easy to reach. Visitors should wear sturdy footwear and be prepared for changing weather conditions in this open countryside setting.

The pentagonal enclosure at Ogden-Fettie is formed by four small mounds together with the village area beside the principal mound. Such enclosures were common among the Ohio Hopewell, but this is the only known example west of Ohio.