In the twenty-first century, Canada’s security and prosperity - and the shared prospects for peace and development globally - depend increasingly on diplomacy rather than defence. In that regard, not least because there are no military solutions for the most pressing problems facing the planet, science diplomacy, and international science and technology more generally, have never mattered more. Yet rather than building a capability to join in collaborative efforts to find and deliver effective responses to complex global issues, under the Conservative Government key Canadian policy instruments were run down. Preoccupied with foreign wars, Islamist terrorism and related fear-inducing threats, Canada’s political decision-makers shunned science, disdained diplomacy and dismissed multilateralism. That record has diminished this country’s international reputation and influence while leaving the population vulnerable and exposed to a wide range of S&T-based threats. If Canada is to face the future with confidence, the new government must reallocate priorities and resources in support of science and diplomacy, and move immediately to address performance issues. Specific policy recommendations conclude this analysis.