Grounded in discussions that took place at two National Roundtable events, this paper outlines why and how K-12 system leaders and their partners must move beyond one-off interventions, programs, and professional development towards an approach where mental health and wellbeing is integrated in the core mandate of public education. In Canada, K-12 education systems have a key role in developing strategies to support the mental health and wellbeing of students and staff. While stand alone programs have provided useful content for educators in addressing mental health and wellbeing, It is increasingly recognized that more systemic and sustainable solutions are required to address these issues over the long-term.