The presented article describing the administrative structure of the Dioceses of Lutsk and Zhytomyr in the fall of 1831 is part of the text describing the state of these dioceses in the light of schematism published for 1832. The description of the Dioceses of Lutsk and Zhytomyr and the previously published description of the Kamieniec diocese are part of a project aimed at presenting the condition of the Latin rite in Russia before the outbreak of the November Uprising. The fall of the uprising accelerated the actions of the Russian authorities aimed at limiting the activities of the Catholic Church and subordinating it to the state. The time of relative freedom of the Church in the tsarist state ended then, as well as the time of unhampered pastoral activity conducted in Polish. The text describes the boundaries of both dioceses, the deanery, parishes, male and female monasteries operating in the diocese, and the churches that functioned at that time. The Lutsk diocese was reactivated in 1798 with the capital in Lutsk, and the diocese of Zhytomyr was established at that time, with the capital in Żhytomyr (connected by a personal union), following the decision of the authorities recognized by the Holy See, they covered the area of the Volyn governorate. In 1831, the Lutsk diocese was divided into ten deaneries, and the Zh?ytomyr diocese – into two. At that time, there were 120 parishes in both dioceses (113 in the Lutsk diocese and 17 in the Zhytomyr diocese). The diocesan clergy conducted pastoral ministry and administered the benefice in 84 parishes, religious in 36. There were 63 monasteries and religious houses, 55 male orders and congregations, and 8 female congregations.