Franz Xaver Dorsch (24 December 1899 – 8 November 1986) was a German civil engineer who became the chief engineer of the Organisation Todt (OT), a civil and military engineering group in Nazi Germany that was responsible for a huge range of engineering projects at home and in the territories occupied by the Germans during the Second World War. He played a leading role in many of the Third Reich's biggest engineering projects, including the construction of the Siegfried Line (Westwall), the Atlantic Wall and numerous other fortifications in Germany and occupied Europe. Following the war, he founded the Dorsch Consult consulting engineering company in Wiesbaden.