Altes Rathaus Arnsberg, Historic town hall in Arnsberg, Germany.

The Altes Rathaus Arnsberg is a plain solid building at the Alter Markt below the bell tower, first rebuilt after a fire in 1600 and reconstructed after the 1709 city fire with 1,057 talers from the Landstände. Its simple lines are complemented by a classicist main portal from around 1840 and a northern pavilion-like archive wing bearing the coat of arms of Elector Maximilian Heinrich of Bavaria. The upper floor retains the Rittersaal with life-size oil paintings of former rulers.

The building was constructed in 1709 following a devastating city fire and served as the administrative center and meeting place for the regional parliament of the Duchy of Westphalia. It represents the city's rebuilt identity after the major fire.

The Rittersaal, the hall on the upper floor that recalls the building's role as the meeting place of the Landstände of the Duchy of Westphalia, holds several life-size oil paintings of former rulers. The municipality and local associations still use it for representative events, while the Bürgersaal is often used for weddings.

The building is equipped with modern accessibility features, including an elevator and emergency staircase for easy access. It is centrally located at Alter Markt 1 in Arnsberg and easily reached on foot.

The blue stone set below the corner niche of the Hallenstraße was, by one reading, where condemned prisoners knelt one last time in prayer before execution; another holds that all delinquents struck it to confirm the verdict before being led to the execution site. If that is right, the stone still stands at the spot of the earlier town hall or court arbour.