Karla Marksa Square, Regional cultural heritage square in Sovetskiy District, Bryansk, Russia.

Karla Marksa Square is a large public plaza in Sovetskiy District with a central fountain and surrounded by significant administrative buildings and the Regional Library. The square functions as a connected open space bringing these structures together.

The square appears as a projected space on Bryansk's regular plan approved by Catherine II in 1780, and by 1791 it was drawn in its present bounds as Krasnaya Square. Around 1920 it was renamed for Karl Marx, while the name Krasnaya passed to the former Church Square in the Fokinsky district. During the occupation of 1941–1943 it briefly bore the name Glinka; since the 1990s restoring the old name has been discussed.

The square's name changed from Krasnaya to Karl Marx around 1920, and during the 1941–1943 occupation it briefly bore the name Glinka. Today it hosts New Year and Maslenitsa celebrations and occasional fairs such as a honey fair, and it is used for rallies and pickets, mainly by the Communist Party and trade unions. The central Krugly Skver holds the city's main New Year tree.

The square has no transport function: it lies at the crossing of Gagarina Boulevard and Karla Marksa Street, and the flat terrain slopes gently from northwest to southeast, a height difference of up to 2.5 m. The central Krugly Skver, about 110 m across, is set back from traffic and reached on foot; its fountain is about 12 m wide.

The square's buildings are grouped in pairs at the inner corners, mostly touching each other except at the eastern corner. Nearly all are three storeys and of similar height, and the sloping ground gives many of them a basement level. The two buildings of the southern corner share the address pl. Karla Marksa, 2 and are linked by floor corridors.