Piazza XX settembre, Square in the Porto district, Bologna, Italy

Piazza XX Settembre is an open square in the Porto district of Bologna, located near the former city walls. Several streets converge here, including Via dell'Indipendenza and Viale Pietro Pietramellara, making it a natural crossroads where pedestrians, cyclists and vehicles all flow together.

The square took shape in the early 20th century when part of Bologna's city walls was torn down, opening up the area to public use. It received its current name in 1909, in memory of September 20, 1870.

The square is named for September 20, 1870, when Italian troops entered Rome through the breach at Porta Pia, completing the unification of Italy. The date is still marked in Bologna, and the name has stayed on the square through the urban changes that followed the demolition of the walls. Nearby, Porta Galliera, the medieval gate rebuilt in the 17th century, stands as the surviving element of the fortifications that once enclosed the city.

The square sits just a short walk from Bologna Centrale station, making it easy to reach at the start or end of a visit. From here, the portico-lined streets of the city center fan out in several directions and can be explored entirely on foot.

The name XXL Piazza Libera appeared in 2011 as part of IMMAGINI, a project by the Fondazione Cassa di Risparmio in Bologna and the Urban Center Bologna that examined the city's transformation. The temporary label was attached to the square during that programme, not adopted as an official name.