From July 26 to August 2, 2021, the 5th International Summer School 3MUGIS (Monitoring, Modeling and Managing Urban Soils and Green Infrastructure) was held within the Department of Landscape Design and Sustainable Ecosystems Smart Urban Nature Laboratory of the RUDN University. The school was organized with the support of the Russian Science Foundation and under the umbrella of the International Union of Soil Scientists, RUDN University and the Institute of Urban Soils of New York in collaboration with universities, scientific organizations and research groups from around the world. The partners of the school were Brooklyn College (USA), Kola Science Center of the Russian Academy of Sciences, Southern Federal University and many others. Importantly, all the organizers and partners of 3MUGIS are united by the desire to exchange knowledge, ideas and experience at the international level.