 Drawing of Marietta Earthworks | |
  Location within Ohio | |
| Location | Washington County, Ohio,  USA |
|---|---|
| Region | Washington County, Ohio |
| Coordinates | 39°25′12″N 81°27′7″W / 39.42000°N 81.45194°W |
| History | |
| Founded | 100 BCE |
| Abandoned | 500 CE |
| Cultures | Ohio Hopewell |
| Architecture | |
| Architectural styles | Platform mounds, burial mound, enclosuress, |
The Marietta Earthworks is an archaeological site located at the confluence of the Muskingum and Ohio Rivers in Washington County, Ohio, United States. Most of this Hopewellian complex of earthworks is now covered by the modern city of Marietta. Archaeologists have dated the ceremonial site's construction to approximately 100 BCE to 500 CE.