Saint Alphonsus Church, Italianate church building in Lower Garden District, New Orleans, US

Saint Alphonsus Church is a former Catholic church at 2029 Constance Street in the Lower Garden District, completed in 1857. Its Italianate brick facade is symmetrical, with a central entrance flanked by two square towers topped by crosses, and ornamented with pilasters, corbelled brick panels, and niches holding statues. The interior has a coved plaster ceiling painted by Dominique Canova, Bavarian stained glass by F. X. Zettler, and mosaic tile floors.

St. Alphonsus was built by the Irish Catholic community of the Lower Garden District and completed in 1857. Nearby parishes served the Francophone and German communities, including St. Mary's Assumption Church across the street. The parish closed in 1979, and in the 1980s a local community group took over the building. It was listed on the National Register in 1973 and named a National Historic Landmark in 1996.

St. Alphonsus was built for the Irish Catholic community of the Lower Garden District, while nearby St. Mary's Assumption Church served German Catholics and other parishes served Francophone worshippers. The interior's painted coved ceiling by Dominique Canova and Bavarian stained glass from F. X. Zettler belong to the church's own Irish-American story, not to French or German traditions.

The former church is at 2029 Constance Street, on the north side between St. Andrew and Josephine Streets in the Lower Garden District. It now houses the St. Alphonsus Art and Cultural Center. The building was closed as a parish in 1979 and taken over by a local community group in the 1980s.

The building features mosaic tile floors that display fine craftsmanship and catch visitors' attention as they move through the interior spaces. These decorative floors represent an often-overlooked element of the overall design.