علاءالدین عطاملک بن محمد جوینی not to be confused with إمام‌ الحرمین الجویني

Ata-Malik Juvaini/Juvayni/Juwayni (1226–1283) was a Persian historian who wrote an account of the Mongol Empire entitled Tarīkh-i Jahān-gushā (History of the World Conqueror).
Both his grandfather and his father had held the post of sahib-divan or Minister of Finance for Muhammad Jalal al-Din and Ögedei Khan respectively. Juvaini too became an important official of the empire.
He visited the Mongol capital of Karakorum twice, beginning his history of the Mongols conquests on one such visit.
He had also accompanied Hulagu during the sack of Baghdad in 1258, and the next year was appointed governor of Baghdad, Lower Mesopotamia, and Khuzistan.
Around 1282, Juvayni attended a Mongol quriltai, or assembly, held in the Ala-Taq pastures northeast of Lake Van. He died the following year in Mughan or Arran in Azerbaijan.
The standard edition of Juvayni's history is published under the title Tarīkh-i Jahān-gushā, ed. Mirza Muhammad Qazwini, 3 vol, Gibb Memorial Series 16 (Leiden and London, 1912–37). An English translation by John Andrew Boyle The History of the World-Conqueror was republished in 1997.