Yuwen Zhiji (died 619) was a military officer of the Sui dynasty. He was the son of Yuwen Shu, the Duke of Xu. He was the younger brother of Yuwen Huaji and older brother of Yuwen Huiji (宇文惠及). He had another younger half-brother Yuwen Shiji. His ancestors were from Xiongnu descent with the surname Pòyětóu (破野头). The Poyetous later were naturalized to Xianbei ethnicity and changed their surname to Yuwen (宇文).

In 616, after Shu's death, Emperor Yang made Yuwen Huaji protector-general of the right camp (右屯卫将军) and Zhiji supervisor of indequity (将作少监).

In 618, Zhiji with his brother Huaji conspired with the officers of Xiaoguo Army (骁果军)—Sima Dekan (司马德戡), Zhiji's friend Zhao Xingshu (赵行枢), Xue Shiliang (薛世良), Zhiji's nephew Yang Shilan (杨士覧)—to announce Emperor Yang and killed his youngest son Yang Gao. Emperor Yang was strangled to death by Linghu Xingda (令狐行达). A number of high-level officials, including the prime minister Yu Shiji, Pei Yun (裴蕴), Lai Hu'er (来护儿), Yuan Chong (袁充), Yuwen Xie (宇文协), Yuwen Jiong (宇文皛), and Xiao Ju (萧矩) the Duke of Liang (the nephew of Emperor Yang's wife Empress Xiao), were also put to death. The Xiaoguo Army declared Yang Hao—son of Prince Yang Jun, Emperor Yang's younger brother—the emperor.

Zhiji was made Deputy minister of the Left (左仆射) and went to the North with Huaji. They were obstructed by Wang Shichong's, Li Yuan's, Li Mi's and other forces. Huaji then poisoned Yang Hao and made his base Weixian, declared himself the Emperor of Xu (许帝). He appointed his allies officials, and Zhiji the King of Qi (齐王).

In 619, Yuwen Huaji was defeated at Liaocheng by Dou Jiande. The Yuwen brothers—except Yuwen Shiji, who was then with Feng Deyi in Jibei (济北)—alongside with Yang Shilan, Xu Hongren (许弘仁), Meng Jing (孟景), Yuan Wuda (元武达) were executed. Their severed heads were exposed at the castle's gate.

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宇文智及（572年 - 619年），中国隋朝军事人物，左翊卫将军宇文述之子。宇文化及之弟、宇文士及异母兄。先祖是匈奴人，姓破野头，后归化鲜卑门阀，改姓宇文。

616年，宇文述遗言，向隋炀帝推荐化及为右屯卫将军，智及为将作少监。

618年，智及与兄化及联合武贲郎将司马德戡、武勇郎将赵行枢（智及好友）、直长薛世良、勋士杨士览（智及外甥）谋反弑炀帝。他们拥立智及好友、炀帝弟秦王杨俊之子秦王杨浩为皇帝。

智及任左仆射，宇文兄弟北上，遭到王世充、李渊、李密等势力阻拦。化及毒弑秦王浩，以魏县为根据地，自号许帝，任命百官，宇文智及为齐王。

619年，宇文化及在聊城败于窦建德，宇文兄弟和杨士览、许弘仁、孟景、元武达共同被处死，枭首军门。

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