Ernst Schwarz (28 January 1886 in Landsberg an der Warthe, Brandenburg – May 29, 1958 in Twickenham) was a Communist politician. After attending high school, first in his hometown and then in Berlin, Schwarz attended the University of Grenoble, University of Bonn and Berlin, graduating with a doctorate. During the First World War, he briefly served as a soldier. He became involved with the labour movement in Chemnitz, following the November Revolution. He joined the SPD and was there during the suppression of the Kapp Putsch in 1920. Radicalised by the experience he moved to the USPD, accepting the post of district secretary in Kiel. By the end of the year he was with the KPD.