Arkansas Highway 308 is the name for two different state highways in east Arkansas.

Arkansas Highway 308 is a state highway of 11.9 miles (19.2 km) that runs in Mississippi County.

AR 308 begins at AR 118 and runs south to Birdsong. The route then turns north to concur with AR 77 briefly. AR 308 continues east to cross Interstate 55 before terminating at US 61 in Frenchman's Bayou.

Arkansas Highway 308 is a state highway of 6.2 miles (10.0 km) that runs in Poinsett County.

The route runs north from US 63/AR 149 in Marked Tree. The route turns east and runs to Spear Lake to terminate at AR 135.

Arkansas Highway 308 Spur is a 0.1-mile (0.16 km) spur route north of Marked Tree.

Arkansas Highway 308 Business, colloquially Elm Street, is a business route in Marked Tree. It is 1.3 miles (2.1 km) in length.