PurposeSustainability is a pressing challenge of governance and public financial management. One key element of sustainable governance is the role of citizens. Participatory budgeting (PB) is a participatory tool with which citizens can influence public administration. PB is a democratic process that grants people real power over real money and it has spread around the world. This special issue explores the role of PB in the context of sustainable governance. In this editorial, the authors aim to approach PB as a form of sustainable governance.Design/methodology/approachIn this editorial, the authors collaborate in the analysis of how PB is implicated in the public management of complex social, economic and ecological issues. The authors identify key dimensions of internal and external sustainability based on prior research. The authors approach these dimensions as an internal–external nexus of sustainable governance in which organizational and financial sustainability are the internal dimensions and socio-political and environmental sustainability are the external dimensions.FindingsEven though PB can be seen as one tool for citizen participation, it has the potential to foster sustainability in multiple ways. PB, as a form of sustainable governance, requires a financially and administratively sustainable organizational process that results in the institutionalization of PB. It also includes thorough consideration of socio-political and environmental sustainability impacts of PB.Originality/valueAcademics are actively studying PB from various perspectives. However, most of this work has approached PB from the viewpoints of design and results of PB, and less is known about its institutional settings. PB has not yet been adequately studied in the context of sustainability, and there is a need to scrutinize PB as a form of sustainable governance.