Convent of Mercy, Portuguese colonial convent in São Luís, Brazil.

The Convento das Mercês is a 1654 colonial monastery in São Luís, Maranhão, with about 5,800 m² of built area. Its main facade faces Rua Jacinto Maia, flanked by palm beds, after the fronts of the convent and attached church were reversed in 1905. The 1987–1990 restoration revealed original arches, the old well and the foundations of a demolished church.

The convent was founded in 1654 during the Portuguese colonial period in northeastern Brazil. Over time it served as a center for education and religious practice, and today it stands as one of the city's surviving colonial buildings.

The convent was founded under the invocation of Nossa Senhora da Assunção, yet it is known as das Mercês after the Mercedarian order and the lay brother João das Mercês. Since 2011 it has housed the Fundação da Memória Republicana Brasileira, which runs courses, workshops, exhibitions and festivals for the Desterro neighbourhood.

The building now houses a library, a museum, and an art gallery, all open to visitors. It is worth setting aside enough time to walk through the different areas without rushing.

The convent's library is named after Padre Antônio Vieira, who inaugurated the convent in 1654. It holds more than 23,000 volumes, including 3,217 rare works, with emphasis on Vieira's writings and colonial-era books. The building also keeps about 4,000 artworks, among paintings, sculptures, decorative objects and sacred pieces.