Hetzerhallen Weimar, Industrial heritage building in Weimar, Germany.

The Hetzerhallen are two connected factory halls built in 1907 north of the railway line in Weimar, named after court carpenter Otto Hetzer. Their roofs rest on glued laminated timber beams spanning 21 and 26 metres without interior columns, which is why they were called the large and small Hetzerhalle. The smaller hall bears an honorary plaque for Hetzer, added on 21 October 2004.

Built in 1907 by a woodworking company, the halls used newly developed beam connections that expanded what was possible in timber construction. These techniques later influenced how large wooden structures were built across Europe.

The halls are named after Otto Hetzer (1846–1911), the Grand Ducal Weimar court carpenter and entrepreneur who patented the glued laminated timber beam. Since 21 October 2004 a commemorative plaque for Hetzer has hung on the smaller hall, which was last used as a warehouse and beverage market.

The site lies at Marcel-Paul-Straße 57 in Weimar-Nord, near the former goods station north of the railway line. The large hall collapsed under snow load on 17 February 2021 and the small hall was damaged, so the complex is not open to visitors; the grounds can only be viewed from the public street.

The building used Hetzer beams, an I-shaped timber composite that allowed large roof spans without middle columns supporting the structure. This construction method proved so useful and efficient that similar systems were copied in other industrial countries.