The Dayak are an indigenous people to Borneo; most renowned for their tradition of head-hunting.

The Dayak ethnicity covers more than 200 riverine and hill-dwelling ethnic subgroups; located principally in the interior of Borneo; each with its own dialect; customs; laws; territory and culture. Dayak languages are categorised as part of the Austronesian languages in Asia. The Dayak were animist in belief; however many converted to Christianity; and some to Islam more recently. Estimates for the Dayak population range from 2 to 4 million.