Familismo, or familism, an important Latino cultural construct associated with youth adjustment, describes the importance of family regarding support, comfort, and services. Increased research on familism among Latino families in the past decade has called for a theoretical process model of familism that can guide research on familism, family processes, and youth development. In this article, we propose the behavioral process model of familism (BPMF), which identifies proximal mechanisms through which familism is expected to promote youth psychological adjustment. Specifically, we propose that parenting behaviors (e.g., monitoring, discipline strategies) are a mechanism by which parent familism relates to youth familism and psychological adjustment both directly and via their familism-consistent behaviors. We hypothesize direct and mediated pathways in the BPMF and consider how sociodemographic variables modify the described processes.