This paper explores how Mosaic Governance can advance environmental justice in cities through the co-creation of nature-based solutions (NBS). It examines three case studies in Copenhagen, Utrecht, and Södertälje, highlighting six pathways through which Mosaic Governance contributes to environmental justice: greening the neighborhood, diversifying values and practices, empowering people and communities, bridging across communities, linking to institutions, and scaling inclusive values and approaches. The findings show that Mosaic Governance particularly contributes to recognition justice by aligning NBS practices with community values and aspirations. The results emphasize the importance of a broader framing of justice in NBS development, considering social, cultural, economic, and political inequities. Mosaic Governance holds potential to advance social justice by enabling empowering, bridging, and linking pathways across diverse communities and NBS practices. The study also highlights the importance of long-term engagement, adaptivity, and reflexivity in Mosaic Governance to achieve just transformations. The findings suggest that Mosaic Governance can contribute to procedural and distributional justice by improving the equitable distribution of green spaces and their benefits. However, the study also identifies limitations, such as the need for more research on the capacity of Mosaic Governance to support justice in cities. Overall, the paper demonstrates the potential of Mosaic Governance to advance environmental and social justice through inclusive and participatory approaches.This paper explores how Mosaic Governance can advance environmental justice in cities through the co-creation of nature-based solutions (NBS). It examines three case studies in Copenhagen, Utrecht, and Södertälje, highlighting six pathways through which Mosaic Governance contributes to environmental justice: greening the neighborhood, diversifying values and practices, empowering people and communities, bridging across communities, linking to institutions, and scaling inclusive values and approaches. The findings show that Mosaic Governance particularly contributes to recognition justice by aligning NBS practices with community values and aspirations. The results emphasize the importance of a broader framing of justice in NBS development, considering social, cultural, economic, and political inequities. Mosaic Governance holds potential to advance social justice by enabling empowering, bridging, and linking pathways across diverse communities and NBS practices. The study also highlights the importance of long-term engagement, adaptivity, and reflexivity in Mosaic Governance to achieve just transformations. The findings suggest that Mosaic Governance can contribute to procedural and distributional justice by improving the equitable distribution of green spaces and their benefits. However, the study also identifies limitations, such as the need for more research on the capacity of Mosaic Governance to support justice in cities. Overall, the paper demonstrates the potential of Mosaic Governance to advance environmental and social justice through inclusive and participatory approaches.