Hylestad is a former municipality in the old Aust-Agder county in Norway. The 570-square-kilometre (220 sq mi) former municipality existed from 1915 until its dissolution in 1962. It was located in the southern part of the present-day municipality of Valle in the traditional region of Setesdal in Agder county. The administrative centre was the village of Rysstad where the Hylestad Church was located.