State Route 18 (SR 18) is a 147-mile-long (237 km) state highway that travels west-to-east through portions of Troup, Harris, Meriwether, Pike, Lamar, Monroe, Jones, Wilkinson, and Twiggs counties in the western and central parts of the U.S. state of Georgia. The highway connects US 29/SR 14 in West Point, just east of the Alabama state line, with US 80/SR 19/SR 96 in Jeffersonville, via Pine Mountain, Greenville, Zebulon, Barnesville, Forsyth, Gray, and Gordon.