The Lake Fork is a tributary of the Mohican River, 14.7 mi long, in north-central Ohio in the United States. Via the Mohican, Walhonding, Muskingum and Ohio Rivers, it is part of the watershed of the Mississippi River, draining an area of 344 mi2. The Lake Fork is formed by the confluence of the Jerome Fork and the Muddy Fork in southeastern Ashland County, and flows generally south-southwestwardly into northwestern Holmes County, where it joins the Mohican River, about 3.5 mi southeast of Loudonville. In Ashland County, a 1936 U.S. Army Corps of Engineers dam causes the river to form Mohicanville Lake.