Saint Ignatius of Loyola Church, Buenos Aires, Baroque church in Montserrat, Buenos Aires, Argentina

Saint Ignatius of Loyola Church is a white Baroque church in Montserrat, Buenos Aires, with two towers: the taller right tower holds a clock with Roman numerals, the shorter left tower ends in a cross. Between them, a curved gable with a cross rises above a large grilled window, and three arched entrances open below. Its Latin-cross plan has a central nave and side chapels linked by upper galleries called matroneras.

The Jesuits built a first adobe church here in 1675; in 1686 the south tower and facade rose with bricks from Buenos Aires's first brick kilns. From 1710 Juan Krauss of Pilsen planned the present late German Baroque church, built 1712–1722 and consecrated in 1734. The north clock tower was added in the mid-19th century.

The church was first dedicated to Our Lady of Loreto and took the name San Ignacio in 1610, after Ignatius of Loyola was beatified. Its colonial altarpieces were made by master craftsmen, and the walls were whitewashed. The upper gallery above the side chapels, called matroneras, let people circulate during Mass without disturbing worshippers.

The building is easily accessible and visitors can attend services or book guided tours to learn more about the space. Staff members are available to answer questions and help with navigation.

The north tower with its clock was only added in the mid-19th century by engineer Felipe Senillosa; the south tower is the older one. In one of the side altars rest the remains of Juan José Castelli, cousin of Manuel Belgrano and a member of the First Government Board, who died in 1812.