Yuwen Tai (Chinese: 宇文泰; pinyin: Yǔwén Tài) (507–556), nickname Heita (黑獺), formally Duke Wen of Anding (安定文公), later further posthumously honored by Northern Zhou initially as Prince Wen (文王) then as Emperor Wen (文皇帝) with the temple name Taizu (太祖), was the paramount general of the Chinese/Xianbei state Western Wei, a branch successor state of Northern Wei. In 534, Emperor Xiaowu of Northern Wei, seeking to assert power independent of the paramount general Gao Huan, fled to Yuwen's domain, and when Gao subsequently proclaimed Emperor Xiaojing of Eastern Wei emperor, a split of Northern Wei was effected, and when Yuwen subsequently poisoned Emperor Xiaowu to death around the new year 535 and declared his cousin Yuan Baoju emperor (as Emperor Wen), the split was formalized, with the part under Gao's and Emperor Xiaojing's control known as Eastern Wei and the part under Yuwen's and Emperor Wen's control known as Western Wei. For the rest of his life, Yuwen endeavored to make Western Wei, then much weaker than its eastern counterpart, a strong state, and after his death, his son Yuwen Jue seized the throne from Emperor Gong of Western Wei, establishing Northern Zhou.

Yuwen Tai was born in 507, and was a descendant of the last chieftain of the Xianbei Yuwen tribe Yuwen Yidougui, whose tribe was destroyed by Murong Huang, the founding ruler of Former Yan. Yuwen Yidougui's descendants served as generals during Former Yan and its successor state Later Yan. Later, when Emperor Daowu of Northern Wei defeated the Later Yan emperor Murong Bao (Emperor Huimin), Yuwen Tai's great-great-grandfather Yuwen Ling (宇文陵) surrendered to Northern Wei, and was relocated to Wuchuan (武川, in modern Hohhot, Inner Mongolia). Yuwen Tai's father Yuwen Gong (宇文肱) was known for his ability in battle. In 524, with Northern Wei's northern provinces overrun by agrarian rebels, Wuchuan was being held by one of the major rebels, Poliuhan Baling (破六韓拔陵). Yuwen Gong and another local leader, Heba Duba (賀拔度拔), ambushed Poliuhan's general Wei Kegu (衛可孤) and killed Wei, temporary restoring order. It was probably at this time that Yuwen Tai met and befriended Heba Duba's son Heba Yue (賀拔岳). Sometime after this incident, Yuwen Gong and his sons fled to Zhongshan (中山, in modern Baoding, Hebei), and were forced to join the army of another rebel general, Xianyu Xiuli (鮮于修禮). Yuwen Gong died in a battle between Xianyu's troops and Northern Wei troops, but Yuwen Tai continued to serve in Xianyu's troops. After Xianyu was killed by his general Yuan Hongye (元洪業) in 526, another Xianyu general, Ge Rong (葛榮), in turn killed Yuan and took over Xianyu's troops, and Yuwen continued to serve Ge. However, he saw that Ge was not a competent leader and considered fleeing with his brothers, but before he could carry out his plans, Ge was defeated by the Northern Wei general Erzhu Rong in 528, and Erzhu forcibly moved Ge's troops to his power base at Jinyang (晉陽, in modern Taiyuan, Shanxi). Suspicious of the Yuwen brothers, Erzhu killed Yuwen Tai's older brother Yuwen Luosheng (宇文洛生), but Yuwen Tai pleaded his case with Erzhu and was spared.

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