METHODS: This multicenter qualitative study took place in the context of the Eliminating Monitor Overuse (EMO) SpO2 study, a cross-sectional study to establish rates of cSpO2 in bronchiolitis. We conducted semistructured interviews, informed by the Consolidated Framework for Implementation Research, with a purposive sample of stakeholders at sites with high and low cSpO2 use rates to identify barriers and facilitators to addressing cSpO2 overuse. Interviews were audio recorded and transcribed. Analyses were conducted using an integrated approach. RESULTS: Participants (n = 56) included EMO study site principal investigators (n = 12), hospital administrators (n = 8), physicians (n = 15), nurses (n = 12), and respiratory therapists (n = 9) from 12 hospitals. Results suggest that leadership buy-in, clear authoritative guidelines for SpO2 use incorporated into electronic order sets, regular education about cSpO2 in bronchiolitis, and visual reminders may be needed to reduce cSpO2 utilization. Parental perceptions and individual clinician comfort affect cSpO2 practice. CONCLUSION: We identified barriers and facilitators to deimplementation of cSpO2 for stable patients with bronchiolitis across children’s hospitals with high- and low-cSpO2 use. Based on these data, future deimplementation efforts should focus on clear protocols for cSpO2, EHR changes, and education for hospital staff on bronchiolitis features and rationale for reducing cSpO2. Journal of Hospital Medicine 2020;15:XXX-XXX. © 2020 Society of Hospital Medicine