Église Saint-Léon de Nancy, Gothic Revival church in Nancy, France

Église Saint-Léon is a Gothic Revival church built from 1860 to 1877 by architect Léon Vautrin. Its light stone facade has two towers with paired lancet openings and octagonal ribbed tops modelled on Toul Cathedral; between them a central gable holds a clock face above a rose window, with a statue at the apex. Three pointed portals with sculpted archivolts open at the base.

After the 1852 opening of the Paris–Nancy railway, a new district grew west of the tracks. Bishop Alexis-Basile-Alexandre Menjaud entrusted Abbé Eugène-Alexis Noël with a parish taken from Saint-Sébastien and Saint-Vincent-Saint-Fiacre, dedicated to Leo IX, bishop of Toul from 1026 to 1052. Work began on 25 August 1860 under Léon Vautrin; the first Mass was held on 10 November 1862, the north tower received five bells in 1864, and the church was consecrated on 19 April 1877 by Bishop Joseph-Alfred Foulon.

The parish is dedicated to Pope Leo IX, bishop of Toul from 1026 to 1052, and the church was consecrated on 19 April 1877, his feast day. Four statues stand on the main facade at the level of the tympana: John the Baptist, Saint Joseph, the Virgin Mary and Saint Stanislaus of Kraków, patron of Stanislaus Leszczyński, the last Duke of Lorraine. The north tower received five bells in 1864.

The church stands west of the city centre, in the Poincaré-Foch-Anatole France-Croix de Bourgogne district, close to Nancy-Ville station; the hall facing it across the esplanade and rue Saint-Léon is named after it. The main entrance is the three-portal facade with sculpted archivolts, and the interior is entered from there.

The top stage of the towers copies the octagonal form of those of Toul Cathedral. The organ case was made by Eugène Vallin, the Nancy School cabinetmaker, and the 1889 Cavaillé-Coll organ was replaced in 1975 by a neo-classical instrument from Danion-Gonzalez of Rambervillers.