Trademarks are valuable assets for businesses that are legally protected, yet trademark disputes involving various parties often occur. The settlement of trademark disputes in Indonesia involves two different judicial institutions, namely the State Administrative Court (PTUN) and the Commercial Court, which have the potential to cause disparities in decisions, necessitating simplification efforts to achieve legal certainty and justice. The purpose of this study is to identify the problems that arise in the settlement of trademark disputes between the PTUN and the Commercial Court that hinder the realization of legal certainty and justice, as well as to formulate simplification efforts that can be carried out to achieve legal certainty and justice in the settlement of these trademark disputes. This research uses a normative legal research method with a statutory and conceptual approach, as well as using primary, secondary, and tertiary legal materials collected through literature and document studies. The data analysis technique used is a qualitative analysis of the legal materials obtained systematically and logically to answer the problem formulation and produce recommendations for simplifying dispute resolution. The research results explain that the main problem in the settlement of trademark disputes between the PTUN and the Commercial Court that hinders the realization of legal certainty and justice is the potential for different or contradictory decisions from the two judicial institutions in the same trademark case. This is due to the unclear division of authority, as well as the absence of clear rules regarding the authority of each judicial institution in handling trademark disputes. To achieve legal certainty and justice, efforts that can be made include revising the Trademark Law to clarify the authority of the judicial institutions, regulating alternative dispute resolution mechanisms, increasing coordination and synergy between relevant institutions, increasing the capacity of judges, and establishing an independent and integrated special trademark court.