Using a sample of high school students, this pilot study investigated the relationship between locus of control and a range of suicidal behaviours, the proportion of high school students in an Australian sample who report having engaged in such behaviours and the proportion of suicide attempters who received medical attention following an attempt. Two hundred male and 205 female students aged between 13 and 19 years (mean = 15, SD = 1), attending one randomly chosen metropolitan state high school, completed a questionnaire that included demographic details, the Nowicki-Strickland Locus of Control Scale for Children and questions concerning suicide. The findings indicated that a substantial proportion of individuals in the sample have suicidal ideation. A smaller proportion have engaged in a range of more serious and overt self-destructive and suicidal behaviours. Further, a majority of attempters in the sample had not received medical attention following their attempt. There was also a clear association between locus of control and suicidal behaviour, with the individuals who had engaged in suicidal behaviours characterized by a more external locus of control orientation. This study adds further weight of evidence to the suggestion that the locus of control construct is useful in identifying adolescents at risk of engaging in suicidal behaviour.