Siegfried Hausner (24 January 1952 – 5 May 1975) was a student member of the German Socialist Patients' Collective who was sentenced to three years imprisonment in 1972 for terrorist related crimes.
In 1975 Hausner was handpicked by Siegfried Haag to lead the group, known as Kommando Holger Meins who conducted the West German Embassy siege in Stockholm to force the release of 26 of his RAF comrades.
In the documentary film Stockholm 75, fellow Kommando Holger Meins member Karl-Heinz Dellwo discussed the explosion and explained that only he and Siegfried Hausner were in a position near the detonator to trigger it and that he did not know why it exploded, only that he didn't activate it.
Despite the recommendations of Swedish doctors, Hausner was immediately flown back to West Germany and hospitalized in Stammheim Prison, which had neither the equipment or specialist staff to treat severe burns.
In the final video recording of kidnapped Hanns Martin Schleyer made before his murder by the RAF in October 1977, Schleyer is seen holding a placard that read, “Commando Siegfried Hausner.” The terrorist group involved in Operation Leo planned to rename their unit "Commando Siegfried Hausner" in honour of the deceased extremist before their plot failed.