U+5308 CJK Unified Ideo­graph-​5308

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The Xiongnu (Chinese: 匈奴; pinyin: Xiōngnú, [ɕjʊ́ŋ.nǔ]) were a tribal confederation of nomadic peoples who, according to ancient Chinese sources, inhabited the eastern Eurasian Steppe from the 3rd century BC to the late 1st century AD. Chinese sources report that Modu Chanyu, the supreme leader after 209 BC, founded the Xiongnu Empire.

After their previous rivals, the Yuezhi, migrated west into Central Asia during the 2nd century BC, the Xiongnu became a dominant power on the steppes of East Asia, centred on the Mongolian Plateau. The Xiongnu were also active in areas now part of Siberia, Inner Mongolia, Gansu and Xinjiang. Their relations with adjacent Chinese dynasties to the south-east were complex—alternating between various periods of peace, war, and subjugation. Ultimately, the Xiongnu were defeated by the Han dynasty in a centuries-long conflict, which led to the confederation splitting in two, and forcible resettlement of large numbers of Xiongnu within Han borders. During the Sixteen Kingdoms era, as one of the "Five Barbarians", they founded several dynastic states in northern China, such as the Former Zhao and Hu Xia.

Attempts to identify the Xiongnu with later groups of the western Eurasian Steppe were controversial for a period of time, as Scythians and Sarmatians were concurrently to the west, archaeogenetics confirmed that interaction and connection with the Huns. The identity of the ethnic core of Xiongnu has been a subject of varied hypotheses, because only a few words, mainly titles and personal names, were preserved in the Chinese sources. The name Xiongnu may be cognate with that of the Huns and/or the Huna, although this is disputed. Other linguistic links—all of them also controversial—proposed by scholars include Iranian, Mongolic, Turkic, Uralic, Yeniseian, or multi-ethnic.