The Glady Fork is a tributary of the Dry Fork; via the Dry Fork, the Black Fork, and the Cheat, Monongahela and Ohio rivers, it is part of the watershed of the Mississippi River, draining an area of in the Allegheny Mountains. With the Dry Fork, the Laurel Fork, the Shavers Fork and the Blackwater River, it is considered one of the five principal headwaters tributaries of the Cheat. The stream was named for the presence of glades along the river.