Cabildo Historical Council, Colonial administrative building in Ciudad Vieja, Montevideo, Uruguay

The Cabildo de Montevideo is a two-storey neoclassical building on Plaza Constitución, begun in 1804 by master builder Tomás Toribio and finished in 1869. Its tan and grey stone facade has a triangular pediment with a carved coat of arms, the inscription "1810 1868", four columns with decorated capitals, wooden doors and windows behind a black iron balcony railing, and a dentilled base. Four symmetrical courtyards structure the interior.

Construction of the Cabildo began in 1804 under master builder Tomás Toribio, on the site of an earlier cabildo at Juan Carlos Gómez and Sarandí. After Toribio died in 1810, his son José continued the work, and the building gained its volume after 1829. It was completed in 1869. On 18 July 1830 the first Constitution of the Republic was sworn in one of its rooms, after which it housed the General Assembly while remaining a prison until the late 19th century.

Since 1958 the building has housed the Museo Histórico Cabildo, inaugurated on 21 September of that year as the Museo y Archivo Histórico Municipal. Its collections include iconographic material, plans, books, textiles, furniture and weapons, and since 2014 dedicated storage rooms hold them. The museum also keeps the city's historical archive.

The museum occupies a two-storey neoclassical building with four symmetrical courtyards; the upper floor is reached by a lift installed after excavations in 2024. It faces Plaza Constitución on the Peatonal Sarandí, so it is reached on foot from anywhere in Ciudad Vieja. The main entrance is on the Sarandí side, whose facade was restored in 2014.

Beneath the building lies a circular cistern made of brick and lime mortar dating to 1730, predating the current structure by more than 70 years. This underground chamber shows the site served urban purposes long before the Cabildo was built.