This systematic review aimed to identify how children's right to health, connected to the principles of protection, promotion, and participation, and from the perspectives of children, parents, and professionals in preschool, school, and healthcare has been empirically demonstrated by international scholars between 1989 and 2021. Following the standards of PRISMA-P, two searches, in 2018 and 2020, were conducted in seven databases. In total, 561 studies were found and after the screening process, which entails reviewing titles, abstracts, and full text-versions, 49 studies were finally included. A deductive qualitative content analysis, proposed by Elo and Kyngäs, was performed. According to the findings, protection was demonstrated as "Being protected from harmful acts and practices" and "being entitled to special care and assistance." Promotion was demonstrated as "Possessing of resources and Receiving of services," and participation as "Being heard and listened to" and "Being involved in matters of concern." Conforming to the findings, although presented separately, protection, promotion, and participation could be understood as interrelated concepts. In summary, children's right to health was demonstrated within two major fields: as the use of their own resources, and trust and as aspects provided by adults as support and safety. This is the first review of studies, published 1989-2021, identifying children's right to health through the perspectives of protection, promotion, and participation. During this period, children's right to health has mainly been demonstrated in studies from a healthcare context. All researchers, policymakers, health workers, and politicians should include children in all decisions that concern them, to increase their participation. As children's health is closely linked to their physical, social, and cognitive development there is a need for more studies exploring children's right to health in preschool and school contexts in which children spend their everyday life.