This study book presents all areas of ecclesiastical law that are covered in the full course of Catholic theology. In addition to the universally applicable canon law, it also addresses the specificities of the ecclesiastical legal situation in Germany and Austria. Accordingly, practice-relevant topics occupy a significant space: sacramental law with a focus on marriage law, the Church and its hierarchical structure, and the law of proclamation. Additionally, other topics are introduced, such as ecclesiastical property law, criminal law, and church courts.