How and why does participation matter for procedural justice in environmental governance? Drawing insights from multiple empirical examples that include local, national, and international decision-making processes, this chapter explores the synergies and tensions of the participatory landscape for procedural justice in global environmental governance. It takes the reader through the evolution of approaches to participation and procedural justice to demonstrate how considerations of power—where it is located, how it is sourced and exercised, and how it operates—are central for advancing procedural justice. By directing attention to how accessibility, representation, and capabilities can shape power and influence in decision-making processes, this chapter provides readers with analytical tools for approaching environmental justice through a procedural lens.