The former Evangelical church in Aleksandrów Łódzki, known as the Church of St. Stanislaus Kostka, is a historic temple built between 1827 and 1828 for the Evangelical congregation, designed by architect Gabriel Witkowski. This classical-style structure, made of plastered brick, features a rectangular floor plan and a pseudo-basilica interior with three naves and characteristic galleries. Architectural details such as pilasters, a frieze, and bas-reliefs enhance its visual appeal, along with a three-pitched roof crowned by a Latin cross. Originally used as a place of worship for Evangelicals, the church underwent several changes in purpose after 1945. Following World War II, it was handed over to the Roman Catholic parish, serving as a subsidiary church. Between 2002 and 2017, the building was used as the Ecumenical Center for Dialogue of Religions and Cultures, and in 2016, it became the cathedral of the bishop of the Old Catholic Church in Poland, highlighting its significance as a venue for interfaith dialogue. In December 2022, a parish of the Old Catholic Church was established there. Interestingly, the church retained its original pipe organ case, though the pipes have since been replaced with an electronic instrument. Beyond its religious functions, the church plays an important cultural role, hosting town ceremonies and interdenominational meetings that bring together diverse religious and cultural traditions of the local community. The church complex also includes a classical-style rectory, which now houses the Public Library, further enriching the cultural offerings of Aleksandrów Łódzki.