Julian Borchardt (13 January 1868 – 16 February 1932) was a socialist politician, journalist, activist and participant in the Zimmerwald Left.
He became a socialist journalist and writer, serving as editor on Social Democrat newspapers from 1901 to 1906.
He was appointed as a lecturer to the SPD central education committee in 1907 and entered the Prussian diet in 1911.
In 1913 he relinquished these posts and started editing Lichtstrahlen, which provided a platform for German and international left anti-war-opposition and texts of the nascent Communist movement towards the end of the First World War and after.
He also wrote on historical and economic subjects including a widely translated digest of Karl Marx's Das Kapital.