Plaza Dorrego, Historic square in San Telmo, Buenos Aires, Argentina.

Plaza Dorrego is a public square in San Telmo located at the corner of two main streets and surrounded by multi-story colonial buildings. The space is defined by stone pavement and features areas where restaurants set up their outdoor seating.

The square existed as the Alto de las Carretas by 1586, where ox carts halted before crossing the Tercero del Sur stream. In 1734 Ignacio Bustillo y Cevallos donated land to the Jesuits on condition they build a residence at Alto de San Pedro; after their 1767 expulsion the site passed to the Junta de Temporalidades. Renamed Plaza del Comercio in 1822, it took its current name in 1900 (or 1905 in some sources). In 1978 it was declared a Historic Site for Buenos Aires' adherence to the 1816 independence declaration.

The square hosts a weekly antique market where vendors sell handmade items and rare finds while tango dancers perform spontaneously. This gathering has developed over decades and reflects the artistic heritage of the neighborhood.

The square sits at the corner of Defensa and Humberto Primero streets, with a side cut named after bandoneonist Anselmo Aieta. It is a pedestrian-friendly spot ringed by cafes and bars whose tables spill onto the paving. The Sunday antiques fair fills the square with stalls, so come early if you want room to walk.

The square was declared a Historic Site in 1978 because Buenos Aires residents endorsed Argentina's Declaration of Independence there. Its name honours Colonel Manuel Dorrego, though the sources differ on the date of the change: 1900 in one, 1905 in the other.