Grassy Mountain is a summit in Murray County, Georgia. At its highest point, the mountain has an elevation of . It is the second tallest peak in Murray County, if using a 100 feet (30 m) prominence rule, behind nearby Bald Mountain.
Grassy Mountain is located in the Chattahoochee-Oconee National Forest near Lake Conasauga. There is a fire lookout tower at the top of the mountain that offers views of Fort Mountain, the Cohutta Wilderness and the Ridge-and-Valley Appalachians.