The Białystok Ghetto Uprising of World War II, was a Jewish insurrection in the Białystok Ghetto against the Nazi German occupation authorities, launched on the night of August 16, 1943. The Uprising was the second largest ghetto uprising organized in Nazi occupied Poland after the Warsaw Ghetto Uprising of January 1943. It was led by the Anti-Fascist Military Organisation (Antyfaszystowska Organizacja Bojowa), a branch of the Warsaw Anti-Fascist Bloc.