Research on Origen of Alexandria (185-253/54) is a vibrant and growing field of patristic research all over the world. Clavis Origenis aims to provide scholars with up-to-date information about Origen's numerous writings. It records all printed pre-modern versions of Origenian texts together with critical editions and translations in modern languages, followed by a list of modern studies on the texts and their transmission. A short introduction to each of Origen's writings provides essential information about its date and setting, its transmission in the original Greek or in Latin translation, and the current status of its text. The online edition of Clavis Origenis redirects to open-access digital works and studies