Günther Schneider-Siemssen (7 June 1926 – 2 June 2015) was a German-born Austrian scenic designer, working as the chief designer for all Austrian State Theatres and the Salzburg Festival, where he created 28 productions for Herbert von Karajan and 60 for Otto Schenk. He was a pioneer in using lighting and projections on stage. He designed sets for major international opera houses.