Ismail II (Persian: اسماعیل دوم; Born Ismail Mirza; 31 May 1537 – 24 November 1577) was the third Shah of Safavid Iran from 1576 to 1577. He was the second son of Tahmasp I with his principal consort, Sultanum Begum. By the orders of Tahmasp, Ismail spent twenty years imprisoned in Qahqaheh Castle; whether for his recurrent conflicts with the realm's influential vassals, or for his growing popularity between the Qizilbash tribes, resulting in Tahmasp becoming wary of his son's influence.