Emerging literature has highlighted the importance of discerning general and strategic organizational context (OC) factors (e.g., leadership and climate) and their interaction effect on individual implementation behaviors (e.g., attitudes toward evidence-based practices; EBPs) in youth mental healthcare. This study aimed to examine how leadership and climate (general and strategic) are associated with implementer attitudes toward EBPs across the individual and organizational levels and their interaction effect in schools. A series of multilevel models (MLMs) were fitted on a diverse sample of schools actively implementing universal prevention programs for youth mental health (441 implementers from 52 schools). The organization-level aggregates and individual educators' perceptions of general and strategic leadership and climate, and their interaction terms, were entered as level-2 and level-1 predictors of four attitudinal dimensions (Requirement, Openness, Appeal, and Divergence) based on their level of measurement. At the organizational level, higher levels of strategic leadership and climate, but not their general counterparts, were consistently associated with more favorable attitudes in all four dimensions. At the individual/within-school level, higher levels of perceived general and strategic leadership and climate were associated with more favorable attitudes of Requirement and Openness. At the organizational/between-school level, general climate moderated the positive effect of strategic climate on implementers' perception of appeal and divergence of EBPs. Our findings indicate that leaders should make data-based decisions to allocate resources on strategic and/or general leadership and climate to foster favorable staff attitudes toward EBPs based on the level of measurement, implementation-specificity, and attitudinal dimensions.