King Huanhui of Han (Chinese: 韩桓惠王; pinyin: Hán Huánhuì Wáng) (died 239 BC), ancestral name Jì (姬), clan name Hán (韩), personal name unknown, was the ruler of the State of Han between 272 BC and until his death in 239 BC. He was the son of King Xi of Han. During his reign, Han Fei submitted numerous proposals to enact Legalism. In 246 BC, King Huanhui sent Zheng Guo west to Qin to construct a canal with the intention of wasting Qin's resources. The canal came to be known as Zhengguo Canal.

In the 55th year of King Nan of Zhou (262 BC), Qin sent Bai Qi to invade Han and took Yewang. To broker peace, King Huanhui ceded Shangdang Commandery to Qin. The people of Shangdang refused to be ruled by Qin but also lacked the military strength for defense. Shangdang's governor-general Feng Ting (冯亭) surrendered instead to Zhao. Zhao accepted the surrender and sent Lian Po to defend Changping; the Battle of Changping ensued.

King Huanhui died in 239 BC and was succeeded by his son King An of Han.

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韓桓惠王（？ - 前239年），又作韓桓王、韓惠王、悼惠王，韓釐王之子。在位時，韓非多次上書，要求推行法治。韓桓惠王二十七年，鄭國奉桓惠王之命西去秦國，勸說秦王興修水利工程，以消耗秦國國力，是為鄭國渠。

周赧王五十五年（前262年），秦國大將白起進攻韓國，佔領了野王（今河南沁陽），韓桓惠王割上黨（今山西長治）給秦國求和，要太守靳黈將上黨交接給秦國，上黨人既不想被秦統治，又無力抗秦，所以靳黈不肯，韓桓惠王已經許諾了秦相國應侯范且，不敢違約，就把靳黈罷免，改任馮亭為上黨郡太守，但馮亭依然率郡中軍民，歸順趙國。

趙國接受上黨，並遣名將廉頗麾重兵進駐長平（今山西高平）拒秦，雙方發動長平之戰。前239年韓桓惠王薨，子韓安立。

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