File:Plaza San Martín (4728814329).jpg

Plaza San Martín (Spanish: San Martín Square) is a park located in the Retiro neighbourhood of Buenos Aires.

A succession of colonial Spanish governors had their official residences built on what today is the plaza and, in 1713, the land was sold to the British South Sea Company. The South Sea Company operated their slave trade out of the former governor's residence and a fort and bullring were later built nearby. The land was the site of Gen. John Whitelocke's 1807 defeat upon King George III's second attempt to conquer Buenos Aires, whereby the area became known as the "Field of Glory". The Revolution of 1810 brought an autonomous government to Buenos Aires, which entrusted the Mounted Grenadiers to José de San Martín and allowed him to establish his main barracks at the plaza. An 1813 resolution abolished the slave trade in the United Provinces of the Río de la Plata and the slave quarters were shuttered. Following his decisive military victories, Gen. San Martín was forced into exile in 1824 for political reasons; but a reappraisal of his place in history led to his becoming nearly eponymous in Argentina after his passing in 1850. Accordingly, French sculptor Louis-Joseph Daumas was commissioned in 1862 to create an equestrian statue of the hero of the Wars for Independence and the square was renamed in his honor in 1878, upon the hundredth anniversary of his birth. Monument to José de San Martín, the plaza namesake.

Following remodeling works by British architect Edward Taylor and Argentine architect José Canale, the fort, bullring and other buildings were demolished in 1883 by order of Mayor Torcuato de Alvear, converting the area into a plaza. Numerous Ombú, Linden and Floss Silk trees were planted. The same administration also shaped the Plaza de Mayo, nearby and in 1889 French urbanist Charles Thays was commissioned to give the plaza its approximate current form (among numerous other designs he left Argentina over the next twenty years). The plaza became the preferred surroundings for some of Argentina's wealthiest landowners around 1900. Three architecturally significant mansions facing the plaza surviving today were the Beaux Arts Anchorena Palace (today the ceremonial annex of the Foreign Ministry), the Second Empire Paz Palace (today the Military Officers' Association) and the Neogothic Haedo palace (today the Secretariat of Environmental Policy). 'Monumento a los Caídos en Malvinas' (Monument for the fallen in the Falklands War) is located in Plaza San Martin