Le Yanwei (樂彥瑋) (died 676), courtesy name Degui (德珪), was an official of the Chinese Tang Dynasty, serving briefly as chancellor during the reign of Emperor Gaozong.

Le Yanwei was from the Tang capital Chang'an. As of 656, he was serving as imperial attendant, when Liu Hongye, the son of Liu Ji, a former chancellor who was accused of improprieties (comparing himself to historical regents Yi Yin and Huo Guang) and forced to commit suicide by Emperor Gaozong's father Emperor Taizong in 646, submitted a petition accusing the recently deposed chancellor Chu Suiliang of having falsely accused Liu Ji in 645. (Liu Hongye did so at the instigation of the chancellor Li Yifu, who was a political enemy of Chu and a former subordinate of Liu Ji.) Emperor Gaozong consulted his officials, and they, wanting to ingratiate themselves with Li Yifu, an ally to Emperor Gaozong's powerful wife Empress Wu (later known as Wu Zetian), all were in favor of reversing the judgment on Liu Ji. Le, however, opposed this, stating:

Emperor Gaozong agreed and suspended further discussion. Soon thereafter, one of Le's parents died, and he left governmental service. He was soon recalled to serve as the prefect of Tang Prefecture (唐州, roughly modern Nanyang, Henan). As he went to see the emperor to thank for the commission, Emperor Gaozong remembered his willingness to stand up to Li Yifu, and kept him at the central government's examination bureau (東臺, Dong Tai) as a mid-level official. Around new year 665, Le was serving as Xi Tai Shilang (西臺侍郎) -- the deputy head of the legislative bureau (西臺, Xi Tai) -- as well as a staff member for Emperor Gaozong's crown prince Li Hong, when he was given the designation Tong Dong Xi Tai Sanpin, making him a chancellor de facto. However, about four months later, both he and his colleague Sun Chuyue were no longer chancellors. He was instead made imperial censor, succeeding Liu Rengui. He was still imperial censor in 670 when the generals Xue Rengui, Guo Daifeng (郭待封), and Ashina Daozhen (阿史那道真) suffered a major loss to Tufan forces commanded by its general Gar Trinring Tsendro ("Lun Qinling" (論欽陵) in Chinese). Emperor Gaozong sent Le to the army to investigate, and he put Xue, Guo, and Ashina in chains and delivered them back to Chang'an, where Emperor Gaozong spared their lives but removed them from their posts. Le died in 676 and was buried with honor. His son Le Sihui later also served as a chancellor, during the reign of Wu Zetian.

樂彥瑋（？ - 676年），字德珪，中國唐朝官員，唐高宗年間短暫拜為宰相。

樂彥瑋是唐朝都城長安人。顯慶年間，為給事中。顯慶元年（656年），因自比伊尹、霍光而被彈劾並于貞觀二十年（646年）被唐太宗賜死的前宰相劉洎之子劉弘業在新被罷免的宰相褚遂良的政敵、時任宰相中書侍郎的劉洎舊部李義府指使下，詣闕上言，彈劾褚遂良于貞觀十九年（645年）誣告其父。高宗諮詢群臣，群臣因李義府為武皇后（後稱武則天）的政治盟友，為了討好李義府，都贊成給劉洎翻案。但樂彥瑋反對，說：「劉洎是大臣，舉措應該得當，人主暫時不豫，怎麼就能有所圖謀？前朝給他的處罰不是不恰當的。而且皇帝是無過的，如果給劉洎平反昭雪，豈不是說先帝用刑不當嗎？」唐高宗同意了，停止了此事。不久，樂彥瑋丁憂去職，起複為唐州刺史。樂彥瑋入殿告辭時，高宗想起他曾直言反對李義府，于是複拜為東台舍人。累遷西台侍郎，麟德元年（664年）十二月，在太子右中護、檢校西台侍郎任上被授同東西台三品，為實質宰相。二年（665年）四月，和孫處約一同罷相。乾封元年（666年）代劉仁軌為大司憲。咸亨元年（670年），邏娑道行軍大總管薛仁貴和副總管郭待封、阿史那道真大敗于吐蕃相論欽陵，高宗敕樂彥瑋去軍中調查戰敗情況，將三將都械送京師，高宗免他們死罪，皆除名。後來樂彥瑋的官職改回舊名御史大夫。樂彥瑋認為下屬兩名御史不夠，加設副承詔一人。上元三年（676年），樂彥瑋卒，贈秦州都督（《新唐書》本傳作齊州都督）。子白水令樂思訓、樂思晦。樂思晦後來在武則天年間亦為宰相。永昌年間，因樂思晦顯貴，樂彥瑋得以重贈為揚州大都督。

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