Family researchers and policy makers are giving increasing attention to the consequences of immigration for families. Immigration affects the lives of family members who migrate as well as those who remain behind and has important consequences for family formation, kinship ties, living arrangements, and children's outcomes. We present a selective review of the literature on immigrant families in the United States, focusing on key research themes and needs. A summary of secondary data sets that can be used to study immigrant families is presented as well as suggestions for future research in this increasingly important area of family research and policy. (Contains 3 figures.)