Yelü Chucai (Yeh-lu Chu-tsai; Chinese: ????; pinyin: Yelu Chucái; Wade–Giles: Yeh1-lü4 Ch'u3-ts'ai2; Mongolian: Urtu Saqal, ?????, "long beard"; the components of his name also variously spelt Yeh-Lu, Ye Liu, Yeliu, Chutsai, Ch'u-Ts'ai, etc.) (July 24, 1190 - June 20, 1244) was a statesman of Khitan ethnicity with royal family lineage to the Liao Dynasty, who became a vigorous adviser and administrator of the early Mongol Empire in the Confucian tradition.
He was the first of Genghis Khan's retainers to formulate policy during the Mongol conquests, and he also introduced many administrative reforms in North China during the reign of Genghis Khan and his successor Ögedei.