A book town is a town or village with many used book or antiquarian bookstores. These stores, as well as literary festivals, attract bibliophile tourists. Some book towns are members of the International Organisation of Book Towns.

Hay-on-Wye, known locally as 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.