zhú术赤（蒙古语：ᠵᠥᠴᠢ，鲍培转写：J̌öci，秘史记音：拙赤，西里尔字母：Зүчи，1177年－1225年）是成吉思汗的长子，他的母亲是孛儿帖。

铁木真与孛儿帖结婚时，三姓蔑儿乞部的首领脱黑脱阿，为报其弟赤列都的未婚妻诃额仑当年被铁木真的父亲也速该抢亲之辱，突袭了铁木真的营帐。在混战中，铁木真逃进了不儿罕山（今肯特山），他的妻子和异母却当了脱黑脱阿的俘虏。等救回时孛儿帖已有身孕，术赤可能是蔑儿乞人的孩子，而「术赤」二字是「客人」的意思。因此，从他的出生开始就不断有人怀疑术赤的血统，尤其是二弟察合台常因此与其冲突。

Jochi (Mongolian:Зүчи, Züchi, Kazakh:Жошы, Chinese:术赤, Zhoshy, Crimean Tatar:Cuçi; also spelled Djochi, Jöchi and Juchi) (c. 1181 – February 1227) was the eldest son of Genghis Khan, and presumably one of the four sons by his principal wife Börte, though issues concerning his paternity followed him throughout his life. An accomplished military leader, he participated in his father's conquest of Central Asia, along with his brothers and uncles.