Blockhaus, Guard house at Neustädter Markt in Dresden, Germany

The Blockhaus is the former Neustädter Wache, a free-standing guardhouse on the west side of the Neustädter Brückenkopf of the Augustusbrücke, a few metres from the Goldener Reiter on Neustädter Markt. Zacharias Longuelune designed it; Johann Christoph Knöffel added an intermediate storey and a brick saddle roof, integrating the surrounding arcade into the cubic body.

Built 1732–1737 to plans by Zacharias Longuelune as the Neustädter Wache, on the site of a wooden predecessor from 1683 whose nickname "Blockhaus" passed to the new building. Work stopped after the elector's death in 1733; Johann Christoph Knöffel added a mezzanine and a tiled saddle roof, and the guard moved in in December 1749. Prussian troops signed their capitulation here on 4 September 1759. Burned out in the Second World War, it stood as a ruin for 35 years and was rebuilt in 1978–1982.

The name "Blockhaus" comes from a wooden predecessor on the site, built from 1683, whose nickname carried over to Longuelune's stone building. From December 1749 it housed the Neustadt guard, and after 1989 it served as the House of German-Soviet Friendship with a public restaurant.

The Blockhaus stands free on the west side of the Neustädter Brückenkopf at Neustädter Markt, a few metres from the Goldener Reiter. It is a pedestrian area, reached on foot from the Altstadt across the Augustusbrücke. The building was closed from winter 2013 after flood damage and the institutions housed there moved out, so visitors should expect to see it from outside.

The name "Blockhaus" comes from a wooden predecessor built on this spot from 1683, whose colloquial name carried over to Longuelune's stone building. The 1978–82 reconstruction followed the original exterior but deliberately omitted the 1892 roof extension, so today's silhouette differs from the pre-war one.