This comparative study investigated how early childhood education and care practitioners in South Korea and Norway perceive the concept of children's well-being and their own roles in supporting and facilitating children's well-being. Data were collected through online questionnaires from 198 practitioners and analysed utilising chi-square analyses. The results showed that South Korean practitioners perceived the cognitive and economic domains as more important than Norwegian practitioners. Meanwhile, the practitioners from Norway perceived the social domain as more important than South Korean practitioners. Norwegian practitioners perceived physical needs, need for affection, and enjoyment as more important than Korean practitioners. Norwegian practitioners also monitored every child's well-being and more actively encouraged positive interactions and child-initiated activities. Meanwhile, Korean practitioners perceived the need for safety as important and believed that environments were not safe enough for children's health and well-being. These findings suggest that the educational approaches and sociocultural contexts of the two countries influence children's well-being.