This article focuses on activities of Bishop Michał Klepacz in the specialised committees of the Episcopate of Poland. Already in 1947, the Łódź Bishop was appointed to the Committee for Theological Studies at Church Faculties and in Seminaries, later transformed into the Studies/Studies and Seminars Committee chaired by the bishop in 1959–1967. Since 1947, he had also worked in the School Committee. Two years later, he was appointed a member of the Committee for Negotiations with the Government representing the Church (since 1956, that Committee operated as the Joint Committee of the PRL Government and the Episcopate of Poland Representatives), which was to standardise and organise relations between the Church and the Communist authorities. As a part of works of that Committee, he was one of the authors of the agreement of April 14, 1950. His activities in that body ended in 1963, with a unilateral freezing of its functioning by the PRL government. Bishop Michał Klepacz also made a substantial contribution to the works of the Press Committee, of which he was a member in the first half of the 1950s, and of the Council Committee. It should be added here that his involvement into that last body was strongly influenced by the fact that he was one of the few dignitaries of the Polish Church participating in all four sessions of the Second Vatican Council.