Franz Pfemfert (20 November 1879, Lötzen, East Prussia (now Giżycko, Poland) – 26 May 1954, Mexico City) was a German journalist, editor of Die Aktion, literary critic, politician and portrait photographer. Pfemfert occasionally wrote under the pseudonym U. Gaday (derived from Russian "ugadaj", dt: "guess"). In 1911 he married Alexandra Ramm, who had moved to Berlin from Russia and who was involved in Russian translations. He subsequently became close friends with Leon Trotsky, even though he maintained quite distinct political views.