Urban green spaces impact the individual and collective health of populations. At the city level, they act as regulators of environmental hazards and constitute collective protective factors. At the individual level, they constitute social spaces for encounters and rejuvenation. But, these functions depend on the use made of these green spaces which can be inequitable. This paper presents the results of the analysis of the use of green spaces in the 6 French cities selected in the WHO French Healthy City Network conducted as part of the GREENH-City research project.