AF-borgen, Student society building in Lund, Sweden

AF-borgen is a student society building in Lund situated opposite the University Main Building in Lundagård. It features a grand assembly hall with high ceilings and classical architectural details, equipped to accommodate several hundred people.

AF-borgen was built in 1850–1851 to plans by Hans Jakob Strömberg, a pupil of Carl Georg Brunius, as a square two-storey Gothic-style building with corner turrets. A wing was added on the S:t Annagatan side in 1868, and in 1881 a hall for the student choir was fitted out on its top floor. Fredrik Sundbärg designed the northern Romanesque wing, completed 1909–1911, with a stepped gable, an oriel and a six-storey tower joined to the original corner turret by a shared main entrance; a bronze relief by Axel Ebbe was installed there shortly afterwards. Hans Westman rebuilt the north wing in 1946, adding restaurant rooms between the risalit and the round tower, and a student residence went up on S:t Annagatan in 1947.

The building's nickname, Labyrinten (the Labyrinth), comes from its many additions: an 1868 wing on S:t Annagatan, a Romanesque north wing of 1909–1911, and a 1946 rebuild by Hans Westman. The Academic Society still owns it, and its premises house the student theatre group and other student committees.

The building sits by Lundagård park, opposite the University Main Building, with Kungshuset about 100 m west and Lund Cathedral about 200 m south. The many extensions added since 1868 earned it the nickname Labyrinten, so expect a maze of connected wings and halls. The main entrance, with a recessed portal and stepped gable, joins the six-storey tower to the older corner tower.

The building's many additions earned it the nickname Labyrinten, the Labyrinth. In 1939 the first public meeting of the Reich Association Sweden-Germany was held here, a detail at odds with the student house's later concert history.