Móricz Zsigmond Square (Circus) is one of the most important intersections of Budapest today. It is located at the border of Szentimreváros and Lágymányos in District 11. It is Villányi Street, Bartók Béla Street, Karinthy Frigyes Street and Fehérvári Street that run into or cross the Circus.

At the beginning of the 20th century it was a simple crossroads with Fehérvári Inn as the only building there. The development of the square is closely related to that of Lágymányos. In 1929, it was a named as Horthy Miklós Circus, which was renamed after writer Zsigmond Móricz in 1945. In 1930, Prince St Imre sculpture group was installed in the middle of the square made by Zsigmond Kisfaludi Strobl. In 2004, a life-size bronze sculpture of the eponym, Zsigmond Móricz was unveiled.

The characteristic round building in the middle later nicknamed The Mushroom was constructed in 1942 by the plans of József Schall. In the beginning the building functioned as a tram loop with terminuses for several trams and a suburban train.

The Circus was one of the most important hot spots of resistance during the Revolution of 1956 as it lay along the way of Soviet tanks heading towards bridges over the Danube. The fiercest fights took place on October 24-26 and November 4-5.

After the revolution reconstructions were frequent. In 1972, as part of a considerable reconstruction, the tram loop around the Mushroom was eliminated. Building metro line 4 greatly affected the Circus and a complete remodeling started in 2008. A more extensive pedestrian underpass system was built, tramways were changed and the Mushroom was also refurbished. The arched building behind the Mushroom is a Gregersen row house representing modernist architecture.

The remodeling of Móricz Zsigmond Square was finished in 2014 when the new metro line and Móricz Zsigmond Square Station was opened.