Place Broglie is one of the main squares of the city of Strasbourg in the French departement of Bas-Rhin.
The square is located on the Grande Île, the ancient city center, and has an elongated rectangular shape that is some 275 metres (902 ft) long and 50 metres (160 ft) wide. It is notable for its prestigious surroundings: the Opera House, the City Hall, the Governor's Palace, the Prefect's Palace, the Strasbourg building of the Banque de France and the historic Mess building. Civilian architecture includes Renaissance (n° 2), Rococo (n°12), Art Nouveau (n° 1), Historicism (n° 22) and Half-timbered Alsatian style (n° 15). At the westernmost point of the square, close to the bridge Pont du Théâtre leading to the Neustadt stands the ″Janus fountain″ (fontaine de Janus), designed by Tomi Ungerer and inaugurated in 1988, for the 2000th anniversary of the first mention of Argentoratum.
At the site of the current Banque de France building (a grand Louis XV style edifice from 1925–1927) once stood the birthplace of Charles de Foucauld as well as the house of Philippe-Frédéric de Dietrich where Rouget de l'Isle reportedly sang the Marseillaise for the first time. These former houses and notable events are commemorated on the façade by a set of plaques.