This chapter reviews available information on the phonetics and phonology of indigenous language bilinguals published in the last few decades, focusing on both of the bilinguals’ languages, the interplay between their phonological systems, and the phonetic realizations of the sounds present in their languages. We understand indigenous languages as predominantly minority languages spoken by linguistically distinct and often socially marginalized and vulnerable ethnic groups, autochthonous to a specific region of the world, and found in diglossias with majority international languages resulting from colonization. Indigenous language bilingualism is usually small-scale and involves speaking at least one minority indigenous language and at least one majority international language, thus being a step toward a seemingly inevitable language shift and in some cases an eventual indigenous language disappearance. The dynamic and asymmetrical character of indigenous bilingualism, along with the vast number of language combinations and the speaker community size differences between the members of these language pairs, sets it apart from other types of bilingualism considered in this book.