This study examines how the implementation of Good Corporate Governance (GCG), defined as an entity management system that combines transparency, accountability, responsibility, independence, and fairness, affects corporate reputation. The literature review shows that transparency and accountability strengthen stakeholder trust, while board independence and fairness protect the rights of all parties. Consistent GCG implementation increases credibility in the eyes of the public and investors, facilitates access to funding, and builds long-term loyalty. The Corporate Governance Perception Index (CGPI) reflects the effectiveness of GCG in strengthening the company's reputation profile in the global market.