This study aims to analyze the application of professional ethical principles in the performance of notarial duties and their relationship with legal responsibility and the protection of public trust. This study employs normative legal research using statutory and conceptual approaches. The primary legal materials include Law Number 30 of 2004 concerning the Notary Office, as amended by Law Number 2 of 2014, and the Notary Code of Ethics. The legal materials were analyzed using a prescriptive-qualitative method to examine the relationship between legal norms and professional ethical principles. The results demonstrate that honesty, justice, responsibility, independence, professionalism, moral integrity, and confidentiality constitute the fundamental ethical principles governing notarial practice. These principles are implemented through professional obligations, prohibitions, supervisory mechanisms, and administrative, civil, organizational, and criminal sanctions. Supervision conducted by the Notary Supervisory Council and the Honorary Council of the Indonesian Notary Association plays an important role in maintaining professional compliance and dignity. Consistent implementation of professional ethics is therefore essential to preserve the notary's position as an officium nobile, ensure legal certainty, protect the interests of the parties, and maintain public trust in the notarial institution.
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