Calls for expanded use of tested child mental health interventions in child welfare practice add new urgency to the longstanding question of how to enhance parent engagement in child welfare services, where low and uneven levels of engagement are pervasive, and services to parents and children tend to be separated, leaving important opportunities for parent-child interventions underutilized. Tackling these issues requires both expanded understandings of what engagement entails and the incorporation into child welfare practice of systematic, research-based strategies for supporting parental involvement. Drawing on a review of factors that shape (and often confound) efforts to engage parents in child welfare, and on relevant research, this paper lays the initial foundation for such an approach by identifying and describing six core dimensions of engagement and related intervention strategies. (Contains 1 table.)