Franz Josef Johannes Konrad Jung (26 November 1888, Neisse, Upper Silesia – 21 January 1963, Stuttgart) was a writer, economist and political activist in Germany. He also wrote under the names Franz Larsz and Frank Ryberg. He grew up in Neisse (now Nysa) and was a childhood friend of the poet Max Herrmann-Neisse. He studied music, law and economics in Leipzig, Jena, Breslau and Munich. From 1909 he worked as a journalist and soon started writing for Der Sturm and Die Aktion. The Austrian psychoanalyst Otto Gross was a large influence upon him