Positive Behavioral Interventions and Supports (PBIS) is a widely implemented framework for promoting positive school systems and fostering students' social, emotional, behavioral, and mental health. Numerous studies indicate that PBIS implementation improves student outcomes, educator practices, and school systems. This brief presents the findings of a systematic literature review exploring how Tier 1 PBIS implementation affects valued educational outcomes. Findings demonstrate that PBIS can be designated an evidence-based practice for reducing exclusionary discipline and improving social, emotional, and behavioral outcomes.