RecruitingBehavioural interventionSuicide Prevention for Substance Using Youth Experiencing HomelessnessSuicide is the leading cause of death among YEH and most youth do not access services that may be available to them. Therefore, this study seeks to address this gap in the research literature with the goal to identify an effective intervention that can be readily adopted by communities that serve these youth. We will test the effects of outreach-worker delivered Cognitive Therapy for Suicide Prevention (CTSP)+Services as Usual (SAU) versus SAU alone on suicidal ideation (primary outcome), substance use and depressive symptoms (secondary outcomes) at 3, 6, 9 and 12- months.