Hay-on-Wye, or simply Hay, is a market town and community in Powys, Wales, in the historic county of Brecknockshire. With over twenty bookshops, it is often described as a "town of books"; it is both the National Book Town of Wales and the site of the annual Hay Festival. The community had a population of 1,675 at the 2021 census. The town is twinned with Redu, a village in the Belgian municipality of Libin, and with Timbuktu, Mali, West Africa.