The purpose of this study is to analyze: 1) What is the position of the Ombudsman as a Public Service Supervisor? 2) What is the authority of the Ombudman in overseeing the realization of Good Governance of the Republic of Indonesia? The research method used is empirical juridical with a statutory approach, concept approach, and case studies. The results showed that: 1) The position of the Ombudsman of the Republic of Indonesia in the constitutional system of the Republic of Indonesia is that the Ombudsman is one of the additional state institutions or secondary or extra auxiliary institutions, namely state institutions formed outside the constitution in this case the 1945 Constitution. Thus, the Ombudsman answers the demands of the community for the creation of democratic principles in every administration of government through an accountable, independent, trustworthy and free from interference by political interests. 2) In the view of the Ombudsman of the Republic of Indonesia, the essence of good governance is the provision of quality public services to the community. The state/state administrator has the obligation to provide services to its citizens while citizens/communities have the right to obtain services.