Hôtel Montaudouin, Neoclassical private mansion in Place Maréchal-Foch, Nantes, France.

Hôtel Montaudouin is a Neoclassical private mansion on Place Maréchal-Foch featuring a symmetrical facade with Corinthian columns that support a pediment adorned with sculpted coats of arms in the Italian loggia style. The structure demonstrates the formal composition typical of this architectural period.

Mathurin Crucy, city architect from 1780, redesigned the plot and drew up the mansion project launched in 1783 for M. de Martel. The first occupants were Anne Montaudouin de la Clartière, Martel's mother-in-law, in the wing near Hôtel d'Aux, and the widow Dulac in the part near the cathedral. The north part was listed on 2 July 1951, the south part (hôtel Dulac) on 19 March 1954.

The building reflects how wealthy Nantes families expressed their status through elegant private residences during the city's expansion. Such mansions shaped the character of the square and demonstrated the connection between prosperity and architectural taste.

The exterior remains visible from Place Maréchal-Foch, though the interior is usually closed to visitors. Access inside is possible only during heritage day events when special tours are organized.

The mansion forms an architectural pair with Hôtel d'Aux, with both buildings framing the square and defining its spatial arrangement. This deliberate placement of two matching residences reveals the thoughtful urban planning of the period.