Altruism, which is often equated with the notion of prosocial behavior, is the selfless provision of help to other people. We notice the difference between these two concepts in the fact that altruistic behavior is not motivated by rewards, while prosocial behavior may be a consequence of seeing benefits for the helper. Although theorists argue that there is a difference between altruism and prosocial behavior, the existence of pure altruism has not yet been sufficiently examined, so this two concepts are equated. Research has shown that there are various factors that influence prosocial behavior in children. One of them is social acceptance among peers. Children who have social interactions with peers are more prone to prosocial behavior as opposed to children who are socially isolated (Klarin, 2002). The aim of the research was to determine the connection between the tendency to help and the social integration and school success of children in primary education. An online questionnaire was conducted with seventh and eighth grade children from several primary schools in the City of Zagreb. The questionnaire consisted of three parts, a questionnaire on general data (gender, grade, school achievement), a questionnaire on the propensity to help students and a questionnaire on satisfaction with relationships with peers at school. In research participated 102 students, 73 eighth graders and 29 seventh graders. The sample included 55 girls and 47 boys. The obtained results showed that girls are more inclined to help than boys, but there is no significant difference in social integration. Also, students who have better general school success and better results in the Croatian language are more inclined to help than students who have a grade of very good and lower. Although it was thought that children with better school performance in Croatian Language and Mathematics would be better socially integrated, this only applies to general school achievement. The research has not established a link between the propensity to help and social integration, but further research is needed on this topic in order to better understand the child's social functioning within school institutions.