Acadia Cliffs State Nature Preserve is a state nature preserve in Washington County, Ohio, United States, with a small neck extending into Athens County, Ohio. Covering an area of 112 acres (0.45 km2), it was founded in 1994. It is known for its sandstone cliffs. For a time, it was administered by the Ohio State Division of Wildlife, but is now administered by the Ohio Division of Nature Preserves.