Land seizure registration constitutes a fundamental component of the Indonesian land registration system, serving as a legal instrument to ensure legal certainty in land disputes. However, in practice, negligence in the registration of land seizure by Land Offices remains prevalent and undermines effective legal protection. This study is intended to examine the legal framework governing the registration of land seizure under Regulation of the Minister of Agrarian Affairs and Spatial Planning/Head of the National Land Agency Number 13 of 2017, as well as to assess the legal consequences that may arise when such registration is neglected. The research applies a normative juridical method with statutory and conceptual approaches, and the results demonstrate that, although the regulation provides a clear legal framework establishing seizure registration as a mechanism of legal publicity, its implementation remains ineffective due to the absence of explicit supervisory mechanisms and enforceable sanctions; as a result, failure to register land seizure creates legal uncertainty, allows the transfer of disputed land to bona fide third parties, and undermines the credibility of the land registration system. Accordingly, strengthening the regulatory framework, enhancing institutional coordination, and developing an integrated digital land administration system are necessary to ensure the effectiveness of seizure registration and to uphold legal certainty within the Indonesian land law system.