Wills Creek is a tributary of the Muskingum River, 92.2 mi (148.4 km) long, in eastern Ohio in the United States. Via the Muskingum and Ohio Rivers, it is part of the watershed of the Mississippi River. It drains an area of 853 mi² (2,209 km²). The United States Board on Geographic Names settled on "Wills Creek" as the stream's name in 1963. According to the Geographic Names Information System, it has also been known historically as "Cou-wach-en-ink" and as "Will's Creek." Near its mouth, a flood-control dam causes the creek to form Wills Creek Lake.