© 2020, Springer Science+Business Media, LLC, part of Springer Nature. This controlled trial evaluated the effectiveness of a mental health literacy intervention for parents delivered through community sport clubs. In total, 540 parents (321 females, 219 males) of adolescent athletes participated in a brief educational workshop on youth mental health (n = 352) or a community-matched control group (n = 188). Generalised linear mixed models revealed no significant improvements in the intervention group compared to control in the primary mental health literacy outcomes, at 1 month follow-up. However, parents in the intervention group were more likely to seek formal help for themselves, had increased confidence and knowledge to help someone experiencing a mental health disorder, experienced reduced psychological distress, and perceived more support from other parents in their sport club, relative to the control group. Overall, the findings suggest that a brief educational intervention delivered through community sports clubs can positively affect some components of parents’ mental health literacy.