The Osieck Deanery, one of the 25 Roman Catholic deaneries in the Diocese of Siedlce, is based in Osieck, within the Parish of St. Andrew and Bartholomew the Apostles. The deanery comprises nine parishes, including the Parish of Our Lady Queen of Poland in Gocław and the Parish of Our Lady of Sorrows in Mariańskie Porzecze, which are connected not only by spirituality but also by the region’s traditional cultural values. Osieck, known for its picturesque setting, boasts diverse sacred architecture, with historic churches that reflect the area’s rich history and religious traditions. A notable example is the Parish of St. Andrew and Bartholomew the Apostles, led by parish priest Fr. Canon Krzysztof Samsel, which serves as the central point of the deanery. The deanery has approximately 24,511 faithful, highlighting its significance within the diocesan structure and the active participation of the community in religious life. Gatherings, masses, and local traditions create a rich cultural mosaic and foster integration among residents. Interestingly, the Osieck Deanery neighbors the deaneries of Czersk, Garwolin, and Warka, facilitating cooperation and the exchange of experiences among parishes. It is also worth noting that places like Pilawa, with its Parish of Our Lady of Kodeń, attract believers seeking to explore local holidays and rituals, which are an integral part of the community’s life.