Plaza Colón, Public square in Monserrat district, Buenos Aires, Argentina.

Plaza Colón is a semicircular green space in Monserrat, east of the Casa Rosada, bounded by Avenida de la Rábida. Its curved outline follows the footprint of the demolished Aduana Taylor, the customs house built on land reclaimed from the Río de la Plata. The straight side is now occupied by the Museo del Bicentenario, built over excavated galleries of the old customs house with an iron-and-glass roof.

The land was reclaimed from the Río de la Plata in the 1850s for Edward Taylor's semicircular Aduana Nueva, demolished after the Puerto Madero works (1887–1898) moved the shoreline east. Landscape architect Charles Thays designed the park, inaugurated on 9 October 1904. For the 1910 Centenary the Italian community donated Arnaldo Zocchi's Carrara marble Columbus monument, unveiled on 15 June 1921; it was dismantled and removed in June 2013.

The plaza is a gathering place for locals and hosts community events, positioned right next to important government buildings in the heart of the city. Its proximity to Casa Rosada makes it a natural meeting point for people visiting the political center.

The plaza is freely accessible throughout the day and offers multiple seating areas for visitors exploring the neighborhood. It is easy to walk around and take in the surroundings, especially when weather permits.

The park's semicircular plan traces the footprint of the Aduana Taylor, the customs house designed by British engineer Edward Taylor in the 1850s on land reclaimed from the Río de la Plata. The round side faced the river; the straight side now borders the Museo del Bicentenario, built over its excavated galleries.