Hôtel de Lamoignon, Renaissance private mansion in Quartier Saint-Gervais, France.

The Hôtel de Lamoignon is a Renaissance private mansion in Paris built around a central courtyard with a main structure and side wings. The stone facades display carefully crafted architectural details typical of the period, with refined proportions and carved ornamentation.

François de Pisseleu had Philibert de l'Orme begin a mansion here in 1559, but only the base, central stair and southern half were built. Diane de France, duchess of Angoulême, acquired it in 1584 and completed the work in 1611-1612. Her heir Charles de Valois added a wing along Rue des Francs-Bourgeois between 1624 and 1640, and the Lamoignon family owned it until 1750.

During the 1600s, the mansion served as a gathering place where prominent writers and thinkers of Paris met to discuss literature and philosophy. This intellectual tradition remains part of the place's identity today.

The building now houses the Historical Library of Paris, which holds extensive collections about the city's past. Visitors can view the exterior and explore the courtyard, while the library's interior requires prior arrangement to visit.

The small watchtower cabinet built into the corner wall was commissioned by Charles de Valois, who lived here from 1619 to 1650. From it he could keep an eye on both Rue Pavée and Rue des Francs-Bourgeois. He also stored carbines and muskets in the mansion, using it as a military facility during the Wars of Religion.