This article reviews the existing literature on young disadvantaged fathers' involvement with children. It first outlines the predominant theoretical perspectives regarding father involvement among resident (married and cohabiting) biological fathers, resident social fathers (unrelated romantic partners of children's mothers), and nonresident biological fathers. Second, it presents a brief discussion of the ways in which fathers contribute to childrearing. Third, it describes the socioeconomic characteristics of men who enter fatherhood at a young age, highlighting that they tend to be socioeconomically disadvantaged. Fourth, it reviews the empirical research on both antecedents of father involvement and patterns of involvement across father types. Finally, it describes the limitations of existing research and provides suggestions for future research and policy.