Surgical safety checklists (SSC) have been shown to improve outcomes, but effective implementation remains a challenge. This systematic review evaluated the effectiveness of interventions to increase compliance with the World Health Organization’s SSC for adult surgery. Interventions generally fell into one of four categories: modifying the method of SSC delivery, integrating or tailoring the tool for local context, promoting awareness and engagement, and managing organizational policy. Study findings suggest that all approaches resulted in some improvement in compliance.