Hasan Kuchak or Ḥasan-i Kūchik (حسن کوچک; c. 1319–15 December 1343) was a Chupanid prince during the 14th century. He is credited with setting up a nearly independent Chupanid state in northern Persia during the struggles taking place in the aftermath of the Ilkhanate.
Hasan's father, Timurtash, was executed by the Mamelukes in 1328. The son's rise to power began three years after the death of the last powerful Ilkhan, Abu Sa'id. The Jalayirids under Hasan Buzurg had recently mastered western Persia, putting a puppet Muhammad Khan on the Ilkhanid throne in 1336. Hasan attempted to unify the fragmented Chobanid family. Claiming his father was alive, he used a slave named Qara Jari (a possible offspring of Hasan's grandfather Chupan) to impersonate him. The widow of Timurtash was even married to him. Mameluk Sultan Al-Nasr Muhammad, who had ordered Timurtash' execution, attempted to expose the fraud, but without much success. The Chobanids rallied to him; several of them (such as Pir Hosayn) defected from Hasan Buzurg's service. Together, they defeated Hasan Buzurg in Alataq on July 16, 1338. Muhammed Khan was executed, and the region around Tabriz was occupied.
At this point, Qara Jari attempted to get rid of Hasan Kucek and take power for himself, but fled when the effort failed. Following this, Hasan raised Sati Beg, sister of Abu Sa'id and widow of Coban, to the Ilkhanid throne in the summer of 1338. When Togha Temur, another claimant to the throne, invaded from Khurasan in the winter of 1339 at the behest of Hasan Buzurg, the Chobanid offered Sati's hand to him in marriage. Using this to receive letters of assurance from Togha Temur, Hasan Kucek forwarded these to the Jalayirids. Hasan Buzurg, feeling betrayed, stopped his advance in support of Togha, and the latter was forced to retreat in July 1339.