SP is the principal and owner of Gender Equality Solutions. All other authors declare no competing interests. We thank the participants of the “What's known and what's next: charting future action on the mental health consequences of child marriage” symposium, which was hosted by the UCL Global Network on Mental Health and Child Marriage and the Child Marriage Research to Action Network, who indirectly contributed to this Comment. We would like to acknowledge funding provided for the symposium through awards held by RAB from the Academy of Medical Sciences Springboard Award and the Institute for Global Health Pump Priming Award.