Comity has long been considered and invoked by international courts and tribunals for various purposes. Particularly, some courts and tribunals have referred to comity when addressing problems such as potential conflicting decisions. This article argues that the concept has also been found in international intellectual property law, particularly the European Patent law. That is, since its establishment in 2023, the Unified Patent Court has exercised jurisdiction over the infringements or revocation of European patents along with the European Patent Office. As such concurrent jurisdiction and parallel proceedings can cause conflicting decisions, the Court has issued a number of decisions that address a number of relevant issues. This article analyzes the decisions to identify what issues have been addressed by the Court and shows how the concept of comity has been embodied. Ultimately, this article finds that the concept of comity has served as a normative foundation in the decision of the Boards of Appeal of the EPO as in the cases of other international courts or tribunals.