Teachers are in a unique position to identify and support students who experience mental health concerns. The purpose of this systematic review was to (a) identify current available evidence-based teacher training programs related to students' mental health, (b) review the content and delivery methods of the training, and (c) evaluate the quality of the research designs and evaluation methods of the training. Most training programs are delivered face-to-face and include interactive discussion and content knowledge. Content varied among the training programs. Most studies found improved knowledge among teachers; however, no studies found improvement in effective communication.