<p>Youth mental health is a growing concern worldwide. Mental health education—which teaches youth about the signs and symptoms of poor mental health, help-seeking for themselves and peers, and mental health stigma—is a universal prevention strategy to address this crisis. This scoping review seeks to understand policies that mandate universal (i.e., tier one) mental health education in schools. It also summarizes extant evidence about the implementation outcomes of these policies (e.g., fidelity, acceptability, feasibility), as well as experiences of and recommendations for mental health education. 9,114 articles were reviewed by title and abstract, and 41 articles were included in this review. Results indicate that few tier one mental health education policies have been established, and that existing policies likely need to be modified regarding expectations for curriculum content, training, and funding. Results further indicate that implementation of tier one mental health education varies widely due to factors such as lack of training, inconsistent curricula, and lack of buy-in. The reporting on implementation factors was also found to vary widely. This review synthesizes the recommendations of numerous articles and outlines future directions for universal mental health education implementation and policy and finds that ongoing policy evaluation and implementation strategies may be required.</p>