脫歡（；？ - 1301年），《大越史記全書》作脫驩，元世祖忽必烈的第九子，封鎮南王。

至元二十一年（1284年）六月，封鎮南王，賜螭紐金印。七月，奉命征占城，假道越南陳朝。十二月，至越南，陳朝上皇陳聖宗陳日烜派從兄與陳興道將兵拒元。脫歡諭令陳興道退兵，陳興道不從。于是分軍六道進攻越南。二十二年（1285年）正月，轉戰到富良江，大敗越南水軍。陳日烜為爭取御敵的時間，便將最小的妹妹安姿公主送予脫歡。陳日烜棄城而走。脫歡入陳朝京都，不屯富良江北，唆都等人從占城來會。水陸分兵，追擊陳日烜。五月，左丞李恆在安邦海口差點擒獲陳日烜。當時暑雨疫作，糧運不繼，諸將議退軍。脫歡聽從。五月二十，元軍在冊江結筏安浮橋渡河，越軍林中伏兵斬元將唆都。李恆殿後，毒矢貫穿膝蓋，且戰且行，僅衛脫歡出境。至思明州，士馬亡失過半。元世祖得知，敕留蒙古軍百人，漢軍四百人為脫歡宿衛，其他諸軍各回駐地。

第二年（1286年）春，召征東宣慰都元帥來阿八赤與阿裏海牙至大都討論伐安南，立征交趾行尚書省，以阿裏海牙為左丞相，來阿八赤右丞，奧都赤為平章政事，烏馬兒、樊楫等為參知政事，並受脫歡節制。徵發江淮、江西、湖廣三行省蒙古、漢軍七萬人，戰艦五百艘，雲南兵六千人，海外四州黎兵一萬五千人，海道萬戶張文虎等運糧十七萬石，水陸軍一共十萬。

湖廣行省奏請緩師，詔阿裏海牙返回。十一月，脫歡到達思明州，命右丞程鵬飛與奧魯赤等分道並進，來八赤率領萬人為前鋒。脫歡到達界河，來阿八赤擊敗安南軍。諸軍會于萬劫。十二月，脫歡到達茅羅港，攻破浮山寨，率諸軍渡富良江，進逼陳朝京都昇龍。陳聖宗、陳仁宗父子退到啖南堡，諸軍攻下。二十五年（1288年）正月，陳聖宗入海，元軍追之不及，還軍。軍中糧盡，脫歡派烏馬兒至安邦海口迎張文虎的糧船。二月，元軍退到安劫。三月，退到內旁關。安南軍截擊元軍歸路，萬戶張均率所部三千人力戰，元軍出關。陳聖宗率兵三十萬扼守女兒關及邱急嶺，脫歡從單已縣經過盝州回到思明州。來阿八赤、樊楫、萬戶張玉都陣亡。

元世祖以脫歡喪師辱國，命他終身不許入覲。開始，脫歡始受封命鎮鄂州，因為在南征軍中所以沒有鎮守鄂州。二十八年，鎮守揚州。大德五年（1301年），脫歡卒。

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Toghon (Тогоон, 脫歡, Thoát Hoan, ?–1301), also Toghan or Togon, was the ninth son of Kublai Khan, founder of the Yuan dynasty.

He was granted the title Prince Zhennan (鎮南王, Trấn Nam vương "Prince of South Suppressing") and moved his household to Ezhou in 1284.

In the next year, he was dispatched to conquer Champa. He demanded from Đại Việt (now modern Vietnam) a route to Champa, which would trap the Champan army from both north and south, but it was rejected by retired emperor Trần Thánh Tông, whom was the de facto ruler of Đại Việt. As a result, Toghon decided to attack Đại Việt. At first he won several victories and captured Thăng Long, the capital of Đại Việt. Trần Thánh Tông had to offer princess An Tư to him to slow down the pace of the Mongol army. Later he was defeated by Trần Hưng Đạo and fled back to Huguang province.

In 1287, he invaded Vietnam again, but, the Mongol Navy was overwhelmed by Trần dynasty in Bạch Đằng river, and he retreated. This ashamed his father who no longer wished to see him again. He moved to Yangzhou in 1291, where he died 10 years later.