St. Mary's Catholic Church (Guttenberg, Iowa)

St. Mary's Catholic Church is a historic Roman Catholic parish church located in Guttenberg, Iowa, United States. The church is part of the Archdiocese of Dubuque. It is noted for its Gothic Revival architecture and its prominent location overlooking the Mississippi River.

The parish was established in 1847 to serve the growing German Catholic population in the area. The current church building was constructed between 1854 and 1860. Its design is attributed to John Mullany, though this attribution is debated. The building features a towering spire, stained glass windows, and elaborate interior detailing typical of the Gothic Revival style.

St. Mary's Catholic Church has served as a central religious and community institution for the residents of Guttenberg for over a century and a half. It is a landmark in the town and a significant example of religious architecture in northeastern Iowa. The church, rectory and school are contributing properties in the Guttenberg Historic District, which is listed on the National Register of Historic Places. The church continues to serve as an active parish within the Archdiocese of Dubuque.