This chapter looks at various kinds of language revitalization communities, and explores issues affecting different community types and subgroups of speakers within communities. Types include ‘original’ or ancestral communities; exiled, forcibly dispersed or resettled communities; diaspora and migrant communities; and communities of practice and learning. The latter are groups which deliberately develop social revitalization networks focusing on efforts to reverse shift, enhance mutual learning and communication, and mobilize available resources. An example of such a project in Nahuatl, Mexico, is described. Various types of speakers of heritage languages are also described, although we emphasize that categorizing individual speakers and their language competence can be counterproductive for people struggling to speak or learn their heritage language. The case studies describe the younger generation’s interest in developing new Wymysiöeryś identities in the twenty-first century; the diverse language practices of diaspora Mixtec communities; and the creation of a community of practice for the revitalization of Greko, Italy.