Arkansas Highway 91 is a state highway of 25.2 miles (40.6 km) that runs in Craighead and Lawrence Counties.

AR 91 begins in northwest Jonesboro at US 63 BUS. The route runs west in a concurrency with AR 18 over US 63 as Dan Avenue. The concurrency continues west as Kings Highway until AR 18 turns south near Dryden. AR 91 meets AR 230 and AR 228 briefly in rural Lawrence County before again crossing US 63. The route continues north to cross US 67 before terminating at US 412 in Walnut Ridge.