Mass'oud Mirza Zell-e Soltan (, "Mass'oud Mirza the Sultan's Shadow"; 5 January 1850 in Tabriz – 2 July 1918 in Isfahan), or Massud Mirza, was a Persian prince of the Qajar dynasty; he was known as the "Yamin-al-Dowleh" ("Right Hand of the Government"). He was posted as the governor of Isfahan for over 35 years, and the governor of Mazandaran, Fars, and Isfahan for a total of 40 years.
