This article approaches the field of global health governance from the vantage point of shared discourses and norms on the good governance of governance amongst multiple international organisations (IOs). Conceptually, we introduce metagovernance norms as constitutive, reflexive beliefs concerned with institutional order and IO interactions in a given governance field. We argue that such norms are entangled with causal beliefs and problem perceptions that form part of contingent, contested repertoires of knowledge. Moreover, we illustrate how IO ‘expert’ groups form an authoritative subject position from which truth claims about governance are advanced. Empirically, we trace metagovernance norms in discourse(s) amongst eight health IOs since the 1970s. We show how metagovernance norms have been constructed around competing beliefs about governance ‘effectiveness’ and problem perceptions concerned with different forms of ‘complexity’. Our research demonstrates that discourses on institutional order in global health are shaped by metagovernance norms drawing on historically-specific knowledge repertoires.