Arapaso (, Arapafo) is an extinct, poorly attesed eastern Tucanoan language of Brazil, closely related to Miriti.
Arapaso was spoken in the northwestern Amazonas State in the Upper RÃÂo Negro region. Speakers were found in the Vale de Uaupés, within the Alto Rio Negro Indigenous Territory and the Terra IndÃÂgena Médio Rio Negro II.
Arapaso is sometimes considered to be an extinct dialect of the Tukano language (the ethnic population was reported as 328 in 2001). All members of the ethnic group were bilingual in Tukano, and the community was undergoing a language shift to it. Younger generations have also received schooling in Portuguese.