Púxiān Wànnú (蒲鲜万奴) was a Jurchen warlord who established the short-lived Eastern Xia dynasty in 13th-century China.

Púxiān Wànnú is also mentioned under the name fūjīū tāīīshī in Persian historical sources such as the Jami' al-tawarikh.

He originally served the waning Jin dynasty under pressure from the Mongol Empire. While the Mongols under Genghis Khan invaded Jin, a Khitan chief Yelü Liuge (耶律留哥) revolted against the dynasty in Liaodong in 1211 and made contact with the Mongol Empire in the next year. In 1214 Jin dispatched Puxian Wannu to Liaodong, but he was defeated around Kaiyuan. While Mukhali of the Mongol Empire invaded Northern China, Puxian Wannu rebelled against Jin and founded the Dazhen (大眞) kingdom in Dongjing (Liaoyang) in 1215. He adopted the title of Tianwang (天王 lit. Heavenly King) and named his era Tiantai (天泰).

As a result of an internal strife in the Eastern Liao, Yelü Liuge was expelled and sought support from Genghis. The Khitans got a counterattack from Jin and fled to Goryeo without permission. Puxian Wannu capitulated to Mukhali's army and sent his son (铁哥/铁哥 Tiěgē) as a hostage in 1216. However, he revolted soon after that and fled to an island while the Mongol army invaded Liaoxi and Liaodong.

In 1217 he moved from Dongjing to the Tumen River basin possibly to avoid both Mongol and Jin oppressions. He again named his kingdom Eastern Xia or Dongxia (东夏/东夏), established the capital around Yanji and called it Nanjing (南京 literally: "Southern Capital"). His ___domain extended north to Laoyeling Mountains, south to Hamgyŏngnamdo in modern-day North Korea, east to the Sea of Japan and west to the Zhangguangcailing Mountains, corresponding to the borderlands of modern-day China, Russia and North Korea.

He seems to have submitted to the Mongol Empire again. In 1218 the Mongol and Eastern Xia armies jointly intruded into Goryeo to subdue the Khitan remnants. Goryeo also joined the campaign and the Khitans were exterminated. The Mongol army retreated after establishing a "sibling" relationship with Goryeo. Mongol officers with Eastern Xia delegates came to Goryeo to exact tribute.

In 1222 Puxian Wannu revolted against the Mongol Empire yet again while Genghis Khan made an expedition toward the west. Since Goryeo rejected his demand for the opening of trading posts on the border, he invaded Goryeo many times. In 1233 Ögedei's son Güyük attacked Eastern Xia with a large force and captured Puxian Wannu. Wannu was executed by beheading after his capture, and the Eastern Xia collapsed nearly immediately afterwards. With the demise of Puxian Wannu, Jurchen remnants in Manchuria surrendered resulting in almost two hundred years of Mongol rule in Manchuria thereafter. The Jin dynasty was overthrown in the next year.

蒲鲜万奴（？ - 1233年），13世纪前期金国军阀，东夏的创立者。

蒲鲜万奴早年经历不可考，金泰和六年（1206年）作为完颜赛不的副手，献计击败南宋大将皇甫斌。金大安三年（1211年），参加野狐岭战役，大败于成吉思汗率领的蒙古军队。金崇庆二年（1213年），蒲鲜万奴被任命为咸平路招讨使，负责征讨耶律留哥，次年又晋升为辽东宣抚使，成为金国在辽东的最高军事长官，但两次败于耶律留哥。

不久，金国放弃中都，迁都汴梁，辽东失去与中原的联系，蒲鲜万奴遂于天泰元年（1215年）十月，自立称天王，国号「大真」，年号天泰。天泰二年（1216年），蒲鲜万奴降伏于蒙古，送其子帖哥至木华黎处为质。天泰三年（1217年），乘木华黎南下之际，蒲鲜万奴杀死蒙古监军，起兵反抗，率部迁往图们江流域，都南京，国北起老爷岭，南至今朝鲜黄海南道，东抵鲸海，西及张广才岭。此后一度与蒙古、高丽结盟，共同对抗耶律留哥残部耶律喊舍，并与蒙古保持了良好关系。

大同元年（1224年），蒲鲜万奴乘成吉思汗西征未还之机，与蒙古断交。大同十年（1233年），窝阔台遣其子贵由，率军攻占南京，蒲鲜万奴被擒（又说被杀），独立的东夏国灭亡，但其后蒙古仍任命万奴子孙在当地任官，万奴之妻李仙娥与耶律留哥的副手可特哥再婚。

其国号至今颇具争议：中国史书曰「东『夏』」，朝鲜史籍恒云：「东『真』」。