The Sé Square, located in ground zero São Paulo, is the starting point for all the distances of roads departing from Sao Paulo, as well as the numbering reference for the city’s address numbering system, all counted from it.

The current Sé Cathedral, inaugurated in 1954, is one of the five largest neo-Gothic churches in the world and shelters the largest organ in Latin America. It is the third church built on the same site. The first one built in 1616 was replaced by the next in 1764, when São Paulo became the head of the diocese.
The square was developed during this period, from the construction of the city's main church, whose tower was built in 1755 by the slave Tebas, in exchange for his freedom, as told in a samba song by Geraldo Filme.

The first landscaping of the Square, designed in the 70s, has been criticized for encouraging homeless people to dwell on site.
The second remodelling in 2006 was criticized by entities related to the housing rights of the homeless population since the installation of devices dubbed "antimendigos" that drove the low class population out of downtown.

Considered a synonym for the old downtown, the Sé square was the scene of many important events in the history of the country, for example the rally of the Diretas Já.