and Child and Adolescent Services Research CenterObjective: This study investigated a quality indicator for children's mental health, caregiver attendance in youth psychotherapy sessions, within a system-driven implementation of multiple evidence-based practices (EBPs) in children's community mental health services. Method: Administrative claims from nine fiscal years were analyzed to characterize and predict caregiver attendance. Data included characteristics of therapists (n = 8,626), youth clients (n = 134,368), sessions (e.g., individual, family), and the EBP delivered. Clients were primarily Latinx (63%), male (54%) and mean age was 11; they presented with a range of mental health problems. Threelevel mixed models were conducted to examine the association between therapist, youth, service, EBP characteristics and caregiver attendance. Results: Caregivers attended, on average, 46.0% of sessions per client for the full sample and 59.6% of sessions for clients who were clinically indicated, based on age and presenting problem, to receive caregiver-focused treatment.