The Stahlhelm (German for "Steel Helmet") was one of the many paramilitary Freikorps organizations that arose after the defeat of World War I in the Weimar Republic.
Stahlhelm, Bund der Frontsoldaten (German "Steel Helmet, League of Front Soldiers") was founded in the end of 1918 partly by Franz Seldte in the city of Magdeburg. The organization was a accumulation point for nationalistic and anti-Weimar Republic elements. Stahlhelm with its 500,000 thousand members 1930 was the biggest Freikorps organization.
In 1929 Stahlhelm joined the Volksentscheid gegen den Young-Plan to demonstrate against the young plan. Stahlhelm joined together in 1931 with DNVP, NSDAP and Alldeutscher Verband the Harzburger Front, which was a united right-wing front against the Weimar Republic.
Stahlhelm was in 1934 integrated into the Sturmabteilung and dissolved in 1935.