This paper explores how recent European defence spending reflects a strategic application of military Keynesianism rather than a purely threat-driven response. While the term remains largely absent from official rhetoric, EU institutions and Member States have embraced its logic to confront a dual challenge: growing geopolitical insecurity and economic stagnation. By linking defence investment to industrial revival, regional cohesion, and political consensus-building, the EU uses military expenditure as a policy tool to stimulate growth and support rearmament. The paper identifies a secondary form of military Keynesianism, in which defence policy is deliberately bundled with broader economic objectives, showing a shift in the EU’s approach to both security and fiscal policy.