Adoph Germer (1881–1966) was an American socialist political functionary and union organizer. He is best remembered as National Executive Secretary of the Socialist Party of America from 1916 to 1919. It was during this period that the Left Wing Section of the Socialist Party emerged as an organized faction. Germer was instrumental as one of the leaders of the SPA's "Regular" faction in orchestrating a series of suspensions, expulsions, and "reorganizations" of various Left Wing states, branches, and locals and thereby controlling the pivotal 1919 Emergency National Convention of the SPA, and thus forcing the Left Wing to establish new organizations of their own, the Communist Labor Party and the Communist Party of America.