Irrlicht may refer to: Irrlicht, the German name for will-o'-the-wisp, the ghostly light sometimes seen at night over bogs and swamps. "Irrlicht", the ninth song in the Winterreise cycle by Franz Schubert. Irrlicht (album), by Klaus Schulze. Irrlicht Engine, a 3D computer graphics engine. Die Irrlichter, a German mediaval/fantasy/folk band. Irrlicht (film), a 1919 German silent film https://en.wikipedia.org/wiki/Irrlicht