Suicide is the leading cause of death among young people in Australia. The role of childhood/young adulthood exposure to family/domestic violence as a risk factor in engaging in suicidal behaviour is poorly understood. This study aimed to investigate this relationship using multi-system linked data on more than 620,000 young people in Victoria, Australia. The cohort included all young people enrolled in year 9 schooling across the state between 2011 and 2019. Routinely collected administrative data from justice, mortality, welfare, education and health agencies were linked across the lifetime until November 2020. A measure of family/domestic violence exposure as a victim, witness or affect family member was developed utilising police data. An outcome measure of suicide was developed using Victorian Suicide Register data and the Victorian Death Registry and Cause of Death Index data. Stratified by sex, survival analysis was conducted to examine the relationship between exposure to family/domestic violence and suicide, while controlling for mental health service engagement, Indigenous status and episodes of suicidal crisis. Episodes of suicidal crisis was a time-varying covariate, developed by linking data on presentations to emergency department, ambulance and hospital. The prevalence of exposure to family/domestic violence among young people that present to acute health services during suicidal crisis was also investigated, as was patterns and timing of service contact and suicidal behaviour. Findings highlight the complex needs of at-risk young people, critical periods in the life course for intervention, and key sex differences. Findings further raise direct implications for policy and practice, informing service delivery and resource allocation in health and welfare sectors.