The Church of St. Nicholas and St. Margaret in Jedlnia is a Roman Catholic temple that serves as the central element of the local parish. It was established between 1387 and 1391, and its original wooden form was likely funded by Władysław II Jagiełło. Due to its proximity to royal residences, Jedlnia gained historical significance, for example, through the adoption of the so-called Jedlnia Statutes in 1430. The present brick church, built between 1790 and 1792 according to the design of architect Jan Kanty Fontana, was funded by King Stanisław August Poniatowski. Its exterior was completed by Jakub Kubicki, and the interior was finished in 1834. Designed in the Neo-Renaissance style, the church features a three-aisle basilica structure based on a Greek cross plan, and the facade was constructed from red brick. The temple underwent a thorough reconstruction between 1898 and 1901, and its consecration took place in 1903. Between 2009 and 2010, the church underwent conservation work that restored its former splendor. The parish includes several localities, such as Jedlnia, Adolfin, Huta, and Dąbrowa Kozłowska. The church not only serves religious functions but also represents a significant cultural landmark for the local community.