Childhood trauma has been receiving increased attention and it is increasingly being recognized as a significant public health concern (Lang, Campbell, & Vanerploeg, 2015). Trauma exposure involves "actual or threatened death, serious injury, or sexual violence" that is either directly experienced or witnessed, or learning that any traumatic experiences have happened to a loved one, or having repeated exposure to details of traumatic events. This purpose of this review will be to identify, describe and synthesize the evidence of effects of trauma-informed approaches in schools to provide guidance for policymakers and educators and to identify important gaps in the evidence base. studies that are examining effects of the intervention in a school setting serving preK-12 (or equivalent grade levels in other countries) students will be included.