The principal architectural landmark of Banská Belá is the Roman Catholic parish church, devoted to St. John the Evangelist. Constructed in the first half of the 13th century in the late Romanesque style, the church was consecrated in 1243.

In 1590, the church underwent extensive reconstruction in the Gothic-Renaissance style. The tower, believed to be original, likely saw alterations during the Turkish invasions, including the addition of a two-story octagonal superstructure with a covered corridor supported by stone brackets and an internal guardhouse. Atop the tower sits a baroque dome with a lantern. The original late Romanesque window is preserved on the tower. The ground floor of the tower was originally open on three sides with curved arches. From the original Romanesque structure, the perimeter masonry of the church nave and tower have been retained. A lateral Romanesque portal remains on the north side of the nave. The entrance portal from the church vestibule is Gothic. The church interior is dominated by the main Neo-Gothic wooden altar, acquired in 1896 from the Millennium Exhibition in Budapest. The altar features statues of St. John the Evangelist and Apostle in the center, St. Elizabeth of Hungary on the left, with a statue of St. Ladislav beneath her, and a statue of St. Margaret of Scotland on the right, with a statue of St. Stephen beneath her. In the sanctuary, a wooden polychrome pulpit, adorned with ornaments from 1843, replaces the original stone pulpit. Side neo-Gothic altars flank the nave, with a statue of Our Lady of Lourdes on the left and a statue of the Divine Heart of Jesus on the right. In the middle of the nave, between the supporting columns, stands a wooden neo-Gothic baptistery with a statue depicting Jesus being baptized by John the Baptist. The wooden reliefs of the Stations of the Cross on the side walls were crafted by local carver Ján Bazalka in 1985. The late-Baroque wooden benches with volute ornaments date back to the second half of the 18th century. In the second half of the 16th century and the beginning of the 17th century, the church was utilized by Evangelicals. Lateral wooden choirs were added to the front choir (empora) during this time. The choir houses an organ, supplied by Rieger and Sons from Krnov, dating back to 1875. It underwent renovation in 1999. Colored stained glass windows adorn all the windows of the sanctuary and nave, acquired between 1894 and 1897. The sanctuary windows feature figures of St. Paul, St. Anthony of Padua, and St. Peter, while the nave windows display ornamental patterns. Fresco paintings from 1905 adorn the side walls of the sanctuary, while mural paintings on the sanctuary vault and nave were executed by painter Ján Antal. The figures on the nave vault depict Franciscan saints - St. Francis of Assisi and St. Klara. The earliest mentions of the parish date back to the mid-14th century, with the parish re-established in 1466 following the restoration of city rights.