Arledge Mounds I and II are two Native American earthworks near Circleville in south-central Ohio that survive as an undisturbed archaeological site in a farm field. The smaller mound is about 5 feet high and 65 feet across, while the larger is about 20 feet high and 120 feet in diameter. Their rare defining feature is that the two mounds are joined at the base, making them one of the only known conjoined pairs in Ohio. Though they have not been excavated, archaeologists suggest an Adena origin, and the site was recognized on the National Register of Historic Places in 1974 for its potential research value.