The Arapaho language or Arapaho proper (also spelled "Arapahoe"; in Arapaho: Hinóno’eitíít ) is a one of the Plains Algonquian languages, closely related to Gros Ventre and other Arapahoan languages. It is spoken by under 300 people over age 50 in Wyoming, and in Oklahoma by "only a handful of people . . . all near eighty or older". As such, it is in danger of becoming extinct. As of 1996, there were approximately 1,000 speakers among the Northern Arapaho. As of 2008, the authors of a newly published grammar estimated there were slightly over 250 fluent speakers, plus "quite a few near-fluent passive understanders". In 2008, it was reported that a school had been opened to teach the language to children.

La langue arapaho est une langue algonquienne des plaines parlée presqu'exclusivement par des personnes âgées, dans l'état du Wyoming aux États-Unis. La langue, qui est en grand danger d'extinction, a divergé phonologiquement de façon très significative du proto-algonquin , "ours," devient en arapaho wox, et le proto-algonquin , "son époux," devient en arapaho ííx).

Arapaho on arapaho-intiaanien puhuma uhanalainen kieli. Puhujat ovat enimmäkseen Wyomingissa Wind Riverin reservaatissa asuvia vanhuksia.

Arapahot (omakielinen nimitys inuna'ina, "meidän kansa") ovat Pohjois-Amerikan alkuperäiskansa, joka puhuu algonkin-kieliin kuuluvaa arapahon kieltä. Heidän pääasuinalueensa oli (ja on) Wyomingin osavaltio Yhdysvalloissa. Arapahoja oli neljä eri heimoa: nakasinena, basawunena, hanahawunena ja nawathinehena.