Highway 78 (AR 78, Ark. 78, and Hwy. 78) is a designation for two state highways in the Arkansas Delta. One route of 24.03 miles (38.67 km) begins at Highway 306 near Hunter and runs southeast to US Highway 79 (US 79). A second route of 4.30 miles (6.92 km) begins at Highway 121 and runs west to a junction with Lee County Route 132 (CR 132) and CR 173. A short spur route in Moro, Highway 78 Spur connects the parent route to Highway 238. All routes are maintained by the Arkansas State Highway and Transportation Department (AHTD).