Explaining the establishment and centralization process of the Russian Orthodox Church in the Yakut region periodically is very important in order to make the missionary activities carried out on Sakha Turks more understandable. The study was planned from the general to the specific, and the sources giving general information about the Russian Orthodox Church and the works examining the history of Orthodox Christianity in the Yakut Region were used chronologically. In this chapter, the reforms of the Russian Orthodox Church were briefly mentioned, the diocese, blagochiniye and prihod systems were discussed, and the manifestation of these institutions in the Yakut Region was tried to be revealed. The Yakut Region came under the rule of the Russians from 1620, and from 1638, the religious and administrative structure began to be established in the region simultaneously. The first church in the Yakut region was built by Petr Beketov in the Lena Castle, built in 1632. In time, the church and chapel network emerged thanks to the churches built inside the castles built by the Russian Kozak Detachments. The emergence of a central unity between the churches took place at the end of a long process. The most important reason for this is the geographical distance of the region from Moscow. Therefore, the Russian Orthodox Church structuring was carried out gradually in the region. The Yakut spiritual administration continued its activities as the dean of the Siberian Metropolitan, Tobolsk, Irkutsk, Kamchatka Diocese, and finally, with the establishment of the independent Yakut Diocese, the region gradually became both the religious and administrative center of Far East Siberia. After Peter I abolished the Patriarchate and activated the Holy Synod, the Orthodox religious institutions in the region also changed. The Holy Synod took the place of the Patriarchate, and the Bishops took the place of the Metropolitans. The dioceses are divided into sub-units such as dean and decimal. Again, the surrogate priesthood status was implemented, while the first vice priesthood in Siberia was the Irkutsk diocese, the Yakut region was elevated to the surrogate priesthood status in 1858, depending on the Kamchatka diocese. The elevation of the Yakut region to the status of the Viceroyalty was designed by St. Venyaminov. The status change was enough to strengthen Yakut's church network and attract adequately equipped clergy. Yakutsk Orthodox Church, which continued its activities as a deputy priest for approximately 12 years, became the most important religious center of the region as an independent diocese in 1870. Raising Yakutsk to the status of diocese led to the administrative reshaping of the region, and deanships and tithes emerged. In addition, the regional community structure (prihod) was reorganized and it was forbidden to move to another congregation other than the spiritual administration where the fields are registered. [ABSTRACT FROM AUTHOR]