The proposed study evaluates The Core Connectors Initiative (CCI), a high school-based suicide prevention program designed to help youth gain peer support skills and mental health knowledge. CCI involves two phases, a 14-module training phase and an action phase. Facilitators who have backgrounds in counselling psychology or related disciplines will pilot the program in 5 high schools. CCI is based on a peer education suicide prevention program, Youth as Gatekeepers (Ohlmann, Kwee, & Lees, 2014).