The onset of most mental illness and substance dependency typically occurs during adolescence and early adulthood, which coincides with the very age when the majority of students are first encountering the pressures associated with postsecondary education. An effective and easy-to-navigate mental health-care system for postsecondary students helps foster student success throughout university and college. It ensures access to the life-long tools needed to build resiliency, and to navigate a continuously changing future and rapidly evolving labour market. Significant challenges regarding supporting student mental health spurred the Ontario Undergraduate Student Alliance (OUSA), the College Student Alliance (CSA), the Council of Ontario Universities (COU), and Colleges Ontario (CO) to collaborate once again, jointly putting forward key recommendations and principles to foster a proactive approach in addressing and responding to postsecondary mental health. This report, which is an updated version of a report first submitted to politicians in 2017, continues to call for a 'whole-of-community' approach to strengthening mental health services that includes students, post-secondary institutions, health-care providers, community agencies, government, and others. [This report was co-produced by the Ontario Undergraduate Student Alliance (OUSA) and the College Student Alliance (CSA). For the 2017 report, "In It Together: Taking Action on Student Mental Health," see ED603074.]