This chapter provides an overview of the status of the world’s endangered languages, based primarily on data from the Catalogue of Endangered Languages. Difficulties in identifying and enumerating endangered languages and obstacles to assessing linguistic vitality on a large scale are discussed. Statistical overviews are provided of language endangerment by global region, comparing trends in language endangerment across the world. The availability (or widespread absence) of the kinds of data necessary to assess language endangerment is examined, and we encourage linguists to include these types of data in their field reports and other published work. Finally, widely circulated statistics of language endangerment and death are considered.