蒙恬（约前250年－前210年），中国秦朝名将，祖居齐国，祖父蒙骜和父亲蒙武皆为秦国名将。蒙恬北防匈奴多年，威震北方。秦始皇驾崩后，因为支持太子扶苏，被宦官赵高设计处决。

蒙恬最初作过掌理司法文书的官吏。《史记·白起王翦列传》记载蒙恬在前224年作为李信的副手，一起带兵二十万攻楚，独自带领一支分遣队攻克楚国的寝丘（今安徽临泉），李信在攻破鄢（今河南鄢陵）后，引兵向西，与蒙恬在城父（今河南宝丰县东）会合，不久李信军被楚军击破。秦始皇复用王翦为将，蒙恬父蒙武为裨将军带兵六十万攻楚。始皇二十六年（前221年）因为出身将门被秦始皇起用为将军，攻齐国大胜，后任内史。

Meng Tian (died 210 BC) was a general of the Qin dynasty who distinguished himself in campaigns against the Xiongnu and in the construction of the Great Wall of China. He was the elder brother of Meng Yi. He descended from a great line of military generals and architects. His father, Meng Wu, was also a general who served as a deputy to Wang Jian.