Despite the recent prominence of intelligence in post‐Ukraine global policy, it is a Cinderella in international relations studies. Using English School (ES) theorisation, we locate intelligence within the constellation of primary and secondary institutions in international society. Through looking at the Five Eyes, we explore where intelligence sits within widespread claims of a crisis of the post‐1945 liberal international order (LIO) and what role intelligence plays in diplomacy, war and great power management in the context of shifting global power dynamics. Following major twenty‐first century Western intelligence controversies, we argue against raison d'état approaches and for raison de système thinking. In the face of claims of a new Cold War between Russia, China and the West, we see an urgency for policymakers in open societies to re‐think intelligence from an international society perspective that is realistic and normative, and that pays attention to Global South dynamics. Insulating intelligence from politicisation is more important than ever but does not mean that intelligence is a value‐neutral government function.