Púxiān Wànnú (蒲鮮萬奴) was a Jurchen warlord who established the short-lived kingdom of Eastern Xia in 13th century China.

He originally served the dying 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 Tege (铁哥/鐵哥 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/東夏), put the capital around Yanji and called it Nanjing (南京 literally: "Southern Capital"). His domain spread north to Laoyeling Mountains, south to Hamgyŏngnamdo, North Korea, east to the Sea of Japan and west to the Zhangguangcailing Mountains. That covers borderlands of 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. The Jin Dynasty was overthrown in the next year.

蒲鮮萬奴（12世紀 - 1233年），13世紀前期金國軍閥，東夏的創立者。

蒲鮮萬奴早年經歷不可考，1206年作為完顏賽不的副手，獻計擊敗南宋大將皇甫斌。1211年，參加野狐嶺戰役，大敗于成吉思汗率領的蒙古軍隊。1213年，蒲鮮萬奴被任命為咸平路招討使，負責征討耶律留哥，次年又晉升為遼東宣撫使，成為金國在遼東的最高軍事長官，但兩次敗于耶律留哥。

不久，金國放棄中都，遷都汴梁，遼東失去與中原的聯繫，蒲鮮萬奴遂于1215年自立，十月稱王，國號「大真」，年號天泰。1216年，蒲鮮萬奴降伏于蒙古，送其子帖哥至木華黎處為質。次年，乘木華黎南下之際，蒲鮮萬奴殺死蒙古監軍，起兵反抗，率部遷往圖們江流域，都南京，國北起老爺嶺，南至今朝鮮黃海南道，東抵鯨海，西及張廣才嶺。此後一度與蒙古、高麗結盟，共同對抗耶律留哥殘部耶律喊舍，並與蒙古保持了良好關係。

1224年，蒲鮮萬奴乘成吉思汗西征未還之機，與蒙古斷交。1233年，窩闊台遣其子貴由，率軍攻占南京，蒲鮮萬奴被擒（又說被殺），獨立的東夏國滅亡，但其後蒙古仍任命萬奴子孫在當地任官，萬奴之妻李仙娥與耶律留哥的副手可特哥再婚。

其國號至今頗具爭議：中國史書曰「東『夏』」，朝鮮史籍恆云：「東『真』」。