The scattered research history of the Old Frisian runic inscriptions dating to the early Medieval period (ca. AD 400–1000) calls for a comprehensive and systematic reprocessing of these objects within their socio-cultural context and against the backdrop of the Old English Runic tradition. This book presents an annotated edition of 24 inscriptions found in the modern-day Netherlands, England and Germany. It provides the reader with an introduction to runological methodology, a linguistic commentary on the features attested in the inscriptions, and a detailed catalogue which outlines the find history of each object and summarizes previous and new interpretations supplemented by pictures and drawings. This book additionally explores the question of Frisian identity and an independent Frisian runic writing tradition and its relation to the contemporary Anglo-Saxon runic culture. In its entirety, this work provides a rich basis for future research in the field of runic writing around the North Sea and may therefore be of interest to scholars of historical linguistics and early Medieval history and archaeology.