The Arctic is home to some 50 different groups of Indigenous peoples, speaking as many different Indigenous languages, across a broad territory encompassing eight nation-states. With the exception of Kalaallisut (Greenlandic), all are endangered to varying degrees. The colonial legacy, along with current socioeconomic dynamics, are factors contributing to language shift; climate change is a challenge in most Arctic communities that adds to language and cultural shift. Arctic Indigenous peoples are working at local levels, in their homes and communities, and collaboratively across the circumpolar region to increase the vitality of their languages, through active revitalization programs and by addressing the factors contributing to language shift.