The Banate of Só (Hungarian: Sói bánság or Sófölde) was an administrative unit (banate) on the southern borders of the Kingdom of Hungary between the 12th and the early 15th centuries. Appointed by the king, it was governed by a ban, who served as both administrative and military leader. The banate was created upon the territorial expansion of Hungary during the reign of Béla II (1131–1141). Named after the region of Só (Soli), its area stretched from the salt mines around Só (Tuzla), down along both banks of the Bosna till the line of the Sava and Drina rivers.