燕王喜（生卒年不詳），本名姬喜，是戰國時期燕國的末代君主。

二十八年（前227年），秦國攻燕，兵臨易水（河北易縣）。燕太子丹派荊軻、秦舞陽等人以獻督亢之地圖和秦將樊於期首級之名，謀刺秦王政，圖窮而匕見，最終荊軻事敗被殺。燕太子丹逃亡遼東（今遼寧遼陽市），代王嘉慫恿燕王喜弒子，喜殺子獻首級，以解秦王之怒。二十九年（前226年），秦王政派王翦率軍伐燕，同年十月破燕都薊城。三十三年（前222年），生俘喜，燕國滅亡。

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Xi, King of Yan (燕王喜) (?–?) (ruled 255–222 BC) was the last sovereign of the state of Yan in the last days Warring States period of Chinese history. He was the son of King Xiao of Yan (燕孝王). He was born as Ji Xi (姬喜), the same name of King Lie of Zhou (周烈王) and Count Yi of Cao (曹夷伯).

In the 28th year of his reign (227 BC), the State of Qin began its conquest of Yan, and his army approached Yishui (易水), modern-day Yi County, Hebei. Seeing the deep situation in which Yan was in, Crown Prince Dan, King Xi's son, sent an assassin Jing Ke, Qin Wuyang and others to kill the Qin king Ying Zheng, under the guise of presenting him with a map of Dukang (督亢) and the severed head of the Qin general Huan Yi. As Jingke unrolled the map in front of the king, the dagger was revealed, but the assassination failed. This failure only helped to fuel the rage & determination of the king, and he increased the number of troops to conquer the state of Yan and order Wang Zhan to destroy Yan. The bulk of the Yan army was at the frozen Yishui River, Ji (薊) fell the following year and the ruler, King Xi, fled to the Liaodong Commandery. To appease the King of Qin, King Xi had his own son executed by decapitation, and his head presented to the king.

In 222 BC Pyongyang fell as well, and Yan was totally conquered by Qin under the general Wang Ben (王賁), the son of Wang Jian. King Xi of Yan was captured alive, and his fate is not known. Yan was the third last state to fall, and with its destruction the fates of the remaining two kingdoms were sealed.

All except King Xi were featured in the Chinese period epic The Emperor and the Assassin.