This final paper analyses the topic of inspection supervision over the implementation of the Act on the Right of Access to Information. Inspection supervision is carried out by inspectors of the Office of Information Commissioner, and the purpose of the supervision is to ensure that public authorities act in accordance with the provisions of the Act on the Right of Access to Information. The inspection began in mid-2015 when the necessary funds for work were provided and inspectors were employed. Inspectors can check whether public authorities comply with the obligation to provide information to the public, to establish procedure for resolving requests for access to information and to protect the rights of users in the proceedings. Inspection supervision of the implementation of the Act on Right of Access to Information is important because it ensures that information important for citizens and other users is provided in a transparent and timely manner. Therefore, the aim of this paper is to investigate how inspection supervision works, what problems are observed by inspectors during the supervision and what measures and proposals they have addressed to supervised bodies. It will also investigate the submission of petitions in case of violation of the provisions of the Act on the Right of Access to Information.