Immacolata Concezione, Baroque church in Turin, Italy

Immacolata Concezione is a Baroque church on via Arsenale at the corner of via Lascaris in Turin. Its sinuous facade, completed in 1730, is built from the intersection of two circles of equal radius: the outer circle forms the two wings, the inner one curves convexly around the entrance portal. The central nave has a barrel vault decorated with painted cardboard panels and three canvases by Michele Antonio Milocco.

The church was built at the initiative of the marquises Simiana di Pianezza. Work began in 1675, was interrupted in 1677 and ended about twenty years later with the consecration. The design is attributed to the Theatine architect Guarino Guarini on stylistic grounds, but no documentary proof of his authorship exists. From 1776 the building formed part of the archbishopric complex and was called Cappella dell'Arcivescovado.

The church was long used as an oratory for specific functions of the Turin archdiocese; here Giovanni Bosco was ordained priest on 5 June 1841. The left chapel, called "del Crocifisso", is dedicated to Saint Vincent de Paul and holds an altar by Bernardo Antonio Vittone beneath a painting of his preaching by Alessandro Trono.

The church stands at the corner of via Arsenale and via Lascaris, in Turin's centre. It was long closed to the public and unused before a full conservation restoration carried out between 1981 and 1988. The entrance portal sits at the centre of the facade, under a simple pediment and a semicircular lunette.

The facade, finished in 1730, is a sinuous curve built from the intersection of two circles of equal radius centred on the church's axis; the outer circle shapes the two wings, the inner one bulges around the portal. Two empty niches flank the entrance, topped by stucco panels with floral motifs.