Hôtel de Mailly-Nesle, 17th century private mansion in 7th arrondissement, France.

The Hôtel de Mailly-Nesle stands at the corner of 29 quai Voltaire and 2-4 rue de Beaune, in the 7th arrondissement. Only the wing along rue de Beaune survives of the 1633-1634 mansion, after the rest was split into seven lots and largely rebuilt from 1868. Its grey-beige facade has a slate mansard roof with dormers, barred ground-floor windows and wrought-iron balconies.

Built in 1633 and 1634 for Jean de Monchy, seigneur de Mont-Cavrel, the hôtel passed by succession to the Maison de Mailly-Nesle, whose descendants held it until 1737. From 1659 to 1673 one of its apartments was reportedly rented to d'Artagnan, captain of the musketeers. After 1737 it was let to the prince de Liechtenstein, then to the duc de La Trémoïlle and the duc d'Aumont. Seized during the Revolution, it was sold in 1809, then split into seven lots in 1868; only the wing along rue de Beaune survives.

The building's name comes from the Mailly-Nesle family, who held it through inheritance until 1737. From 1846 to 1851 its rooms housed the offices of La Démocratie pacifique, the Fourierist newspaper. The novelist Misia Sert lived here after her marriage to Alfred Edwards in 1905.

The eastern portion of the building now serves as a research center and library for a major Paris museum. Visitors should check ahead for access, as the space functions primarily as a working research facility rather than a traditional public venue.

The 2025 heritage listing names the rooms that survive inside: a gilded salon, a Regency salon, a Directoire salon, and three first-floor salons of the east wing (blue, central and Picard). The late-17th-century staircase and its cage are listed too. The Bérain-style woodwork from one salon was moved in the early 20th century to the château de La Borde at Vernou-en-Sologne.