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Mapuche () or Mapudungun (from mapu 'land' and dungun 'speak, speech') is an Araucanian language related to Huilliche spoken in south-central Chile and west central Argentina by the Mapuche people (from mapu 'land' and che 'people'). It is also spelled Mapuzugun and Mapudungu. It was formerly known as Araucanian, the name given to the Mapuche by the Spaniards; the Mapuche avoid it as a remnant of Spanish colonialism.

Mapudungun is not an official language of Chile or Argentina and has received virtually no government support throughout its history. It is not used as a language of instruction in either country's educational system despite the Chilean government's commitment to provide full access to education in Mapuche areas in southern Chile. There is an ongoing political debate over which alphabet to use as the standard alphabet of written Mapudungun. There are approximately 144,000 native speakers in Chile and another 8,400 in west central Argentina.

As of 2013 only 2.4% of urban speakers and 16% of rural speakers use Mapudungun when speaking with children, and only 3.8% of speakers aged 10–19 years in the south of Chile (the language's stronghold) are "highly competent" in the language.

Speakers of Chilean Spanish who also speak Mapudungun tend to use more impersonal pronouns when speaking Spanish.