The publication of the present collected works of Galileo Galilei was carried out in the year of the centenary of the birth of the great scientist. The publication uses translations of the main works of Galileo, "Dialogue" and "Conversations," as well as "Reasoning about bodies in the water," made with the participation and edited by A. I. Dolgov. We hope that this first collection of Galileo's works in Russian will give readers the opportunity to get acquainted with the work of the great Italian, which is connected by many threads with modern science and is captured in exemplary written works.