Meadowcroft Rockshelter is an archaeological site located near Avella in Jefferson Township, Washington County, Pennsylvania, United States. The site is a rock shelter in a bluff overlooking Cross Creek, and contains evidence that the area may have been continually inhabited for more than 19,000 years. If accurately dated, the site would be the earliest known evidence of human presence and the longest sequence of continuous human occupation in the New World.
The site is located 27 miles west-southwest of Pittsburgh in the Pittsburgh metropolitan area. The site operates as a division of the Heinz History Center of Pittsburgh and has a museum and a reconstruction of a circa 1570s Monongahela Culture Indian village. Meadowcroft Rockshelter is recognized as a National Historic Landmark, a Pennsylvania Commonwealth Treasure, and as an official project of Save America's Treasures.