To construct a model of the influences on ethnic identity among adolescents in immigrant families, we surveyed adolescents and their parents from 81 Armenian families, 47 Vietnamese families, and 88 Mexican families. Adolescents completed measures of ethnic language proficiency, in-group peer social interaction, and ethnic identity. Parents completed a measure of support for cultural maintenance. Across all groups, ethnic language proficiency and in-group peer interaction predicted ethnic identity, and parental cultural maintenance predicted adolescent ethnic language proficiency. However, because of differences among the groups, a separate model was required for each ethnic group. The results suggest both common processes and group differences in the factors that influence ethnic identity.