Hôtel de Montmorin, Historic private mansion in 7th arrondissement, France.

The Hôtel de Montmorin is a private residence from the 18th century standing at the corner of rue Oudinot and boulevard des Invalides, with a stone facade featuring seven window bays across two levels. Today it houses a government ministry, though its interior retains traces of its past as a nobleman's residence.

In 1768 Jean-Baptiste Gaillard de Beaumanoir bought the plot at the corner of rue Plumet and boulevard du Midi and had it rebuilt, ruined himself, and sold it in 1781. Count Armand Marc de Montmorin Saint-Hérem, foreign minister under Louis XVI, acquired it in 1784 and had Brongniart give the main building its present exterior. The City of Paris bought it in 1847 for the Frères des écoles chrétiennes, and after the 1904 law the State took it over in 1906 for the Ministry of the Colonies. The courtyard facade was inscribed as a monument historique on 8 June 1926.

The building's name comes from Armand Marc de Montmorin Saint-Hérem, foreign minister to Louis XVI, who bought it in 1784; he was killed in the September massacres of 1792. His widow and son Antoine-Calixte were guillotined in 1794. Since 1906 the former noble residence has housed the ministry in charge of France's overseas territories, at rue Oudinot numbers 25 and 27.

The building is visible from the street, but since it functions as a government ministry, the interior is not open to the public. The best way to appreciate it is to take a leisurely walk along boulevard des Invalides to examine the stone facade and its decorative details.

The courtyard facade was listed as a monument historique on 8 June 1926, not 1953. Its seven bays, the three central ones slightly projecting under a triangular pediment, are topped by a stone balustrade that hides a low roof. The two short return wings were added when the Frères des écoles chrétiennes occupied the building from 1847.