Skillet Fork is a 98 mi river in southern Illinois in the United States. It is a tributary of the Little Wabash River; via the Little Wabash, Wabash and Ohio rivers, it is part of the watershed of the Mississippi River. The Skillet Fork rises in northeastern Marion County and flows generally southeastwardly through Clay, Wayne, Hamilton and White counties. In its lower course, parts of the river have been straightened and channelized. It joins the Little Wabash River 5 mi upstream of Carmi.