St. Joseph's Church in Wieluń is an important religious site that was originally part of the complex of buildings belonging to the former Piarist college. Its history dates back to the times when it served as a monastery church, and in 1957 it was transformed into a parish church. Architecturally, the church is built in the Baroque style, characterized by rich decorations and a monumental appearance. Its layout is a three-nave basilica, typical of Baroque temples, providing both spaciousness and excellent acoustics. The church is oriented along a north-south axis, which is also an interesting feature in the context of sacred building orientation. Culturally, St. Joseph's Church is an important landmark in Wieluń, integrating the local community and serving as a venue for numerous liturgical and cultural events. Its interior is also noteworthy, housing valuable pieces of sacred art. An interesting historical detail is the transformation of the temple from a place intended for the Piarists into a parish church, reflecting the social and religious changes that took place in Poland in the second half of the 20th century. St. Joseph's Church is not only a witness to history but also plays a vibrant role in the contemporary life of the residents of Wieluń.