The Ross Trails Adena Circle is an archaeological site in the southwestern part of the U.S. state of Ohio. Located northwest of Ross in Butler County, ^[2] it appears to have been a sacred circle constructed by people of the Adena culture. ^[3]: 102

The circle is composed of an earthen wall, approximately 1 foot (0.30 m) high. Its interior, which is slightly raised above the surrounding terrain, can be accessed through a small opening in the wall that appears to have housed a gate at one time. Because the circle has never been excavated, its contents and uses are uncertain; however, archaeologists have speculated that postholes or other evidence of a house or similar structure may be contained within the circle. ^[3]: 103

In 1975, the circle's archaeological value was recognized when it was added to the National Register of Historic Places. The landmarked area includes approximately 3 acres (1.2 ha) of land, ^[1] due to the possibility of finding related artifacts in the close vicinity of the circle. ^[3]: 103

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