In this paper I wrote about the right to access to information in the Republic of Croatia. The paper begins with a brief historical overview of the right to access to information in Europe and in the world. In the first part of the paper, I wrote about the exercise of the right to access to information, its legal regulation and changes to the Act on the Right to Access to Information, which entered into force in 2003. The basic legal terms were elaborated, and I particularly referred to the proportionality and public interest test, which was introduced by the amendments to the Act from 2011, and to the Information Commissioner, who was introduced as a second instance body into our legal system in 2013. The most important source of the right to access information in the Republic of Croatia is the Constitution of the Republic of Croatia. The right to access information is guaranteed to everyone by Article 38, Paragraph 4 of the Constitution of the Republic of Croatia. The principle of proportionality has been elaborated, which prescribes in which cases the respective right can be limited. In the second part, the practice of the Constitutional Court of the Republic of Croatia was analyzed in three cases filed by the GONG association and one case filed by Vladimir Šeks. In conclusion, the paper contains the data from research on the openness of the Croatian Parliament from 2021 and a review of the exercise of the right to access to information in the Republic of Croatia.