Building 29 is a historic aircraft hangar at 162 North Beacon Road, on the western edge of Walnut Ridge Regional Airport in Lawrence County, Arkansas. It is a large metal-framed structure, built in 1942 using the standard DH-1 Army plan for such buildings. It was part of the national home defense efforts of World War II. It is one of a small number of such buildings left in the state, and the only one surviving virtually unaltered of four built at Walnut Ridge, which was used as a military airfield 1941-46. The rear of the building (which faces the street) has had a small brick office cell attached.