Kebek (died 1325/1326) was khan of the Chagatai Khanate from 1309 until 1310, and again from c. 1318 until his death.
Kebek was the son of Duwa, who was khan from 1282 until 1307. During his father's reign Kebek participated in the Mongol invasions of India, leading a punitive expedition against the Sultanate of Delhi in 1305 in retaliation for the destruction of a Mongol army the previous year. He devastated the Punjab region, especially around Multan, but on the return journey his army was attacked on the banks of the Indus River by a force sent from Delhi and suffered a high number of losses (Battle of Amroha). This was one of the last Chagatayid campaigns against India to take place before a temporary cessation of the Mongol raids (1307−1327, when they were resumed under Khan Tarmashirin).
The situation in the Chagatai Khanate following the death of Duwa in 1307 turned volatile, with two of his successors reigning within one year and with the sons of Kaidu still hoping to regain control over the khans. By 1308 Taliqu was in charge of the khanate but his rule was quickly contested. His enemies rallied among Kebek, and they defeated and overthrew Taliqu in 1308 or 1309. As a result, Kebek became khan of the ulus.
At this point the sons of Kaidu decided to make their move against the Chagatayids. Having recently come off his war with Taliqu, Kebek found himself facing an invasion by Yangichar, Orus, Chapar and Tügme. The two sides met near Almaliq, where Kebek's forces ultimately won a pitched battle. Following this, Chapar decided to surrender to the Yuan emperor Khayisan (Emperor Wuzong), permanently ending the threat against the Chagatayids by Kaidu's sons.
With Yangichar and his brothers defeated, Kebek held a quriltai to decide on a future of the khanate. At the quriltai the Mongol princes agreed to recognize Kebek's brother Esen Buqa as khan. Esen Buqa was summoned to take control of the Chagatai Khanate, and Kebek stepped down in his favor.