Governance of International Courts and Tribunals presents the first systematic examination of the institutions, practices, and norms that constitute international judicial governance—the oversight exercised by states and international organisations over international courts and tribunals to ensure their independent, accountable, and effective functioning. Departing from the traditional focus on courts' mandates, jurisprudence, and procedures, the book turns attention to international judicial governance institutions (what the book terms 'injugovins')—the political and executive bodies, such as organs of international organisations or dedicated governance bodies, responsible for overseeing courts. It explores their practices and the normative frameworks that guide them. Injugovins are revealed as crucial yet long-overlooked actors in the international adjudicative landscape. Their performance shapes the entire life cycle of courts—from the adoption of constituent instruments to budgeting, appointments, accountability mechanisms, institutional reform, enforcement, and closure. Many of the challenges faced by courts, including legitimacy crises, limited effectiveness, and political backlash, often stem from, or are worsened by, governance shortcomings. Addressing a long-standing gap in the literature, the volume develops a shared vocabulary and conceptual framework for understanding international judicial governance as a distinct domain of international institutional law and practice. Comprising 24 contributions, it combines conceptual analysis, regime-specific studies, and cross-cutting functional perspectives. It maps historical and contemporary governance models—including those of the PCIJ, ICJ, CJEU, ICC, and African regional courts—and examines key functions such as judicial elections, financial oversight, and enforcement. With empirical depth and analytical clarity, this volume lays the foundations for future research on the legitimacy, oversight, and effectiveness of international courts.