This paper has 3 objectives. First, we review the epidemiologic evidence for the association between suicidal behaviour and suicide in individuals diagnosed with antisocial, borderline, or narcissistic personality disorder. Second, we examine whether any potentially modifiable risk factors are associated with these diagnoses, based on existing empirical evidence. Last, we discuss clinical approaches to assessing youth with antisocial, borderline, or narcissistic personality disorder presenting at risk for suicide.