Children’s opportunities for outdoor free play are declining globally, contributing to growing concerns related to mental health, physical inactivity, childhood obesity, and healthy child development. This initiative, led by HealthBridge brings together researchers, practitioners, civil society organizations, and public officials from Canada, Vietnam, India, Bangladesh, Ghana, and Uganda to strengthen international collaboration on children’s outdoor play and healthy urban environments. The project focuses on sharing knowledge, building partnerships, and co-designing future implementation research related to outdoor free play and child-friendly urban spaces.