This document reviews research on the effectiveness of gatekeeper suicide training programs. It defines gatekeepers as people in the community who regularly interact with individuals or families in crisis, such as teachers, clergy, health workers, and friends/family. The review examines the Question, Persuade, Refer (QPR) gatekeeper training program and finds that such programs effectively increase knowledge of suicide prevention, improve self-efficacy in addressing suicidal thoughts, and help retain information for 6 months or more. The research suggests gatekeeper training positively impacts skills, attitudes and knowledge across various community settings. Future research could analyze how training affects perceived knowledge and self-efficacy based on education levels and prior suicide knowledge.