Casa da Marquesa de Santos, Neoclassical palace in São Cristóvão, Rio de Janeiro, Brazil.

Casa da Marquesa de Santos is a two-story neoclassical building in São Cristóvão featuring curved staircases and an adjoining garden. The facade displays heart-shaped details on windows and doors, with stone frames and decorative moldings above the lintels forming its exterior character.

Emperor Pedro I gifted this residence to his mistress Domitila de Castro, who lived here from 1827 to 1829. The building emerged during Brazil's early monarchy period and reflects the architectural choices and lifestyle of that era.

The house takes its name from Domitila de Castro Canto e Melo, made Marquesa de Santos by Pedro I, who gave her the palace in 1827. Its interior decoration was entrusted to Francisco Pedro do Amaral, who painted the Allegories of the Four Continents, while the Ferrez brothers produced the stucco work. Since 2012 the building has been closed for restoration, and a digital app offers images of period clothing and objects.

The palace has been closed to outside visitors since 2012 for restoration, so the interior cannot currently be toured. While works continue, a free app for iOS and Android offers photos of costumes, accessories and objects from the imperial period. The building belongs to UERJ and museum activities are managed by FUNARJ.

The floors of the house are made from specially crafted Brazilian wood selected specifically for the construction. This choice of material reveals the importance placed on local craftsmanship when building this royal residence.