Arkansas Highway 309 (AR 309 and Hwy. 309) is a designation for two state highways in Western Arkansas. One route of 5.11 miles (8.22 km) runs from Yell County Route 28 (CR 28) at Blue Mountain Lake northeast to Highway 10 at . A second segment begins at Highway 10 in Havana and winds northwest through the Ozark National Forest to Highway 23 at Webb City via Paris. A portion of the second route is designated as the Mount Magazine Scenic Byway, one of eleven Arkansas Scenic Byways maintained by the Arkansas State Highway and Transportation Department (AHTD).