The main purpose of this article is to present a historical outline of the diocese of Pińsk, showing the most important problems connected with its functioning between 1925 and 1939 (from its beginning till the moment of liquidation of the structures of the diocese when the Soviet army entered Pińsk). In the article following themes will be presented: the territory and the religious structure, bishops working in the diocese, the territorial organization, diocesan institutions, the clergy, orders, and monastic communities working on the area of the diocese till the break-out of the Second World War.