Paul Frölich was a German journalist and left-wing political activist and author, a founding member of the Communist Party of Germany and founder of the party's paper, Die Rote Fahne. A Communist Party deputy in the Reichstag on two occasions, Frölich was expelled from the Party in 1928, after which he joined the organized German Communist Opposition movement. Frölich is best remembered as a biographer of Rosa Luxemburg.