Berke Khan (died 1266) (also Birkai; , ) was the ruler of the Golden Horde (division of the Mongol Empire) who effectively consolidated the power of the Blue Horde and White Hordes from 1257 to 1266. He succeeded his brother Batu Khan of the Blue Horde (West) and was responsible for the first official establishment of Islam in a khanate of the Mongol Empire. He allied with the Egyptian Mamluks against another Mongol khanate based in Persia, the Ilkhanate. Berke supported Ariq Böke in the Toluid Civil War, but did not intervene militarily in the war.