Cabildo de la ciudad de Lujan, National historical monument in Luján, Argentina

The Cabildo de la ciudad de Luján is a former town hall from the colonial period, standing across from the main basilica with white walls and traditional Spanish architectural features. The complex now functions as a museum space displaying period furnishings and documents in its original rooms.

Construction began in 1792, funded by the cabildo itself through pontazgo tolls and its own resources, after works had been suspended and resumed in the late 1780s under José Lino Gamboa. In 1810 it was the first ayuntamiento to recognise the Primera Junta. Its activities were suspended in 1821, and it housed the juzgado de paz, police and municipal government until 1910. A demolition plan from the 1910s was rejected in 1917 by commissioner Domingo Fernández Beschtedt, and the building became the Museo Colonial e Histórico, inaugurated on 12 October 1923 with Enrique Udaondo as director.

The museum opened on 12 October 1923 with five rooms: Prisioneros, Invasiones Inglesas, Dr. Muñiz, Brigadier Juan Manuel de Rosas and Independencia, plus the Sala Capitular. Its first director, Enrique Udaondo, called it a permanent tribute to the men of the past. The Cabildo had run a school from 1773 teaching reading, writing, counting and Christian doctrine.

The Cabildo is part of the Complejo Museográfico Provincial «Enrique Udaondo» on Calle Lavalle, together with the Casa del Virrey Sobremonte; both are visited on the same museum circuit. The building sits a short walk from the Basílica de Luján. Its rooms are entered on foot, and the museum opened to the public in 1923.

The Cabildo was nearly demolished in the 1910s under a municipal modernisation plan; commissioner Domingo Fernández Beschtedt rejected the idea in 1917 and pushed for the building to house the Museo Colonial e Histórico. It opened on 12 October 1923 with five rooms, among them the Sala Capitular and the Prisioneros room.