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Objective: The increasing prevalence of and inequities in childhood obesity demand improved access to effective treatment. The SmartMoves curriculum used in Bright Bodies, a proven-effective, intensive health behavior and lifestyle treatment (IHBLT), was disseminated to ≥30 US sites from 2003 to 2018. We aimed to identify barriers to and facilitators of IHBLT implementation/sustainment., Methods: We surveyed and interviewed key informants about experiences acquiring/implementing SmartMoves. In parallel, we analyzed and then integrated survey findings and themes from interviews using the constant comparative method., Results: Participants from 16 sites (53%) completed surveys, and 12 participants at 10 sites completed interviews. The 11 sites (63%) that implemented SmartMoves varied in both use of training opportunities/materials and fidelity to program components. In interviews, demand for obesity programming, organizational priorities, and partnerships facilitated implementation. Seven sites discontinued SmartMoves prior to the COVID-19 pandemic. Funding insecurity and insufficient staffing emerged as dominant barriers to implementation/sustainment discussed by all interviewees, and some also noted participants' competing demands and the program's fit with population as challenges., Conclusions: System- and organizational-level barriers impeded sustainment of an evidence-based IHBLT program. Adequate funding could enable sufficient staffing and training to promote fidelity to the intervention's core functions and adaptation to fit local populations/context., (© 2024 The Obesity Society.)