Simon bar Giora (alternatively known as Simeon bar Giora or Simon ben Giora or Shimon bar Giora, Imperial Aramaic: שִׁמְעוֹן בַּר גִּיּוֹרָא or Hebrew: שִׁמְעוֹן בֵּן גִּיּוֹרָא; died 71 CE) was the leader of one of the major Judean rebel factions during the First Jewish–Roman War in 1st-century Roman Judea, who vied for control of the Jewish polity while attempting to expel the Roman army, but incited a bitter internecine war in the process.