Cook's Mill, also known as The Old Mill and The Greenville Mill, is a historic grist mill and sawmill and national historic district located near Greenville, Monroe County, West Virginia, United States. The district includes one contributing buildings and two contributing structures. The main mill building was built in 1857 on the original stone foundation and site of an earlier mill built in approximately 1796. It is a 2+1⁄2-story, plus basement, hand-hewn post-and-beam building, with massive timbers pegged at their mortise and tenon joints. The district also includes the dam, mill pond, tail race and stream.