This report is an evaluation of a forum WHISE hosted on biological sex, gender, and mental wellbeing. The forum was designed specifically for those who sit in roles in health promotion, health planning, programming, and policy. In collaboration with HER Centre Australia, this event represented the very first event under the new Gender and Mental Wellbeing portfolio for WHISE. It explored the biological determinants of women’s mental wellbeing across the lifespan, including but not limited to menstruation, pregnancy, birth, and menopause. This session also explored the social determinants of mental wellbeing, many of which centre on the impacts of gender inequality, including socioeconomic challenges, experiencing violence and homelessness.