Edgar Julius Jung (pen name: Tyll; 6 March 1894 – 1 July 1934) was a German lawyer born in Ludwigshafen in the Kingdom of Bavaria. He was a leader of the conservative revolutionary movement in Germany that stood in opposition to not only the Weimar Republic, whose parliamentarian system he considered decadent and foreign-imposed, but also National Socialism. Jung was murdered in the 1934 Night of the Long Knives purge.