The Mandate for Mesopotamia (Arabic: الانتداب على بلاد ما بين النهرين, romanized: al-Intidāb ʿalā Bilād mā bayn an-Nahrayn) was a proposed League of Nations mandate to cover Ottoman Iraq (Mesopotamia). It would have been entrusted to the United Kingdom but was superseded by the Anglo-Iraqi Treaty, an agreement between Britain and Iraq with some similarities to the proposed mandate. On paper, the mandate lasted from 1920 to 1932.
The proposed mandate was awarded on 25 April 1920 at the San Remo Conference, in Italy, in accordance with the 1916 Sykes–Picot Agreement but was not yet documented or defined. It was to be a class A mandate under Article 22 of the Covenant of the League of Nations. A draft mandate document was prepared by the British Colonial Office in June 1920 and submitted in draft form to the League of Nations in December 1920.
