匈人是一个古代生活在欧亚大陆的游牧民族。他们在4世纪西迁到了欧洲东部，并入侵东、西罗马帝国。欧洲的古文献对此一民族及其在欧洲的事迹有若干叙述。

5世纪末时，匈人国家逐渐瓦解并从历史消失。匈人自东向西的进攻引发了欧洲民族大迁徙，对欧洲的历史产生了深远影响。18世纪以来，部分学者认为匈人就是中国史书中的匈奴人，但匈人和中国古代的匈奴人是否有血缘关系或系同一民族尚无定论。近年来使用DNA等测试手段也未能回答这一问题。

认为这两个民族系出同源的最主要证据是北匈奴西迁和三百年后在欧洲出现的匈人时间上的吻合。

The Huns were a nomadic people, who lived in Eastern Europe, the Caucasus, and Central Asia between the 1st century AD and the 7th century. They were first reported living east of the Volga River, in an area that was part of Scythia at the time; the Huns' arrival is associated with the migration westward of a Scythian people, the Alans. In 91 AD, the Huns were said to be living near the Caspian Sea and by about 150 had migrated southeast into the Caucasus. By 370, the Huns had established a vast, if short-lived, dominion in Europe.