Krasiński Square (Polish: plac Krasińskich) is a square in the central district of Warsaw, Poland. The square itself is adjacent to Warsaw Old Town and features buildings of great historical and national significance.

The square is located between Długa Street and the outlet of Miodowa Street, and Świętojerska and Bonifraterska Streets. Its name commemorates the Krasiński family of the Ślepowron coat of arms, the owners of the Krasiński Palace.

The square was created on the site of the courtyard of the Krasiński Palace, which was originally enclosed by walls. After the building was purchased by the Polish–Lithuanian Commonwealth in 1765, the courtyard became a public space.

In 1779, opposite the palace, the National Theatre was built, designed by Bonaventura Solari. When the theatre moved to its new building on Theatre Square in 1833, the old one was turned into warehouses, and the square began to host wool fairs. These fairs opened on June 15 and lasted five to six days.

In 1786, a Customs House was built in the southwest corner of the square (later housing the Central Archives of Historical Records), later obscured by the Badeni Palace, erected in 1837–1838.

By the end of the 18th century, the square was partly paved, and by the 19th century, it was fully cobbled with fieldstone.

In 1824, two cast-iron well casings designed by Chrystian Piotr Aigner and made by Tomasz Ewans and Józef Morris’s Warsaw foundry were installed on the square. They replaced earlier obelisk-shaped wells. Aigner gave them the form of ancient altars, decorated with goat-headed Pan reliefs, eagles, festoon motifs, and the date of construction (MDCCCXXIII).

The square was initially intended as the site of the Prince Józef Poniatowski monument, but during his visit to Warsaw in 1829, Tsar Nicholas I ordered the monument to be placed in the courtyard of the Governor’s Palace (now the Presidential Palace) instead.