San Isidro is an affluent partido of Buenos Aires Province, Argentina found in the north of Greater Buenos Aires.

Other towns in the municipality are Acassuso, Beccar, Boulougne, Martínez, and Villa Adelina.

Constructed in Neo-Gothic style, it stands 68 m (223 ft) tall.

It is located opposite Plaza Mitre in San Isidro's historic quarter.

There are a number of sailing clubs on the Río de la Plata.