Porta Santo Stefano, City gate in Bologna, Italy

Porta Santo Stefano consists of two quadrangular neoclassical buildings designed by Filippo Antolini, facing each other across Piazza Santo Stefano where Via Santo Stefano becomes Via Augusto Murri. The gate stands on the road to Florence, near the ring boulevards.

Porta Santo Stefano was first raised in the 13th century with Bologna's third and last ring of walls, on the road to Florence. It was rebuilt and restored over the following two centuries, then severely damaged by artillery during a siege in 1512, when its original tower was destroyed; the next year it was fitted with a new bastion. In 1843 the earlier structures were demolished and replaced by the two facing neoclassical buildings designed by Filippo Antolini for Pope Gregory XVI, known as the barriera gregoriana, which served as a customs post on the Futa road.

Locals call it pôrta ed Stra Stêven or pôrta San Stêven in Bolognese dialect. The two facing neoclassical buildings, designed by Filippo Antolini, frame the roadway of via Santo Stefano. The second building housed the anarchist Circolo Camillo Berneri from 1972 and, from 1997 to 2015, the occupied social centre Atlantide, a hub for transfeminist, queer and punk collectives until its eviction on 9 October 2015.

The gate stands where via Santo Stefano becomes via Augusto Murri, at the ring boulevards, on the road toward Florence via San Ruffillo and Rastignano. The two neoclassical buildings face each other across the square, with the street running between them, so you pass through rather than enter. The iron gate that once closed the passage is now at the Giardini Margherita entrance on the Porta Castiglione side.

The iron gate that once closed the passage was moved to the entrance of the Giardini Margherita on the Porta Castiglione side, where it still stands. The last person to enter through Porta Santo Stefano was King Vittorio Emanuele II of Italy.