Highway 318 (AR 318, Ark. 318, and Hwy. 318) is a designation for two state highways in Phillips County, Arkansas. One route of 4.39 miles (7.07 km) begins at Highway 85 at Oneida and runs east to Highway 44. A second route of 15.12 miles (24.33 km) begins at Highway 1 and runs east to Highway 20. A portion of the route between and Lambrook is designated as part of the Great River Road National Scenic Byway.