Social interactions are fundamental for our development and vital for our existence. Thus, it is reasonable to assume that social interactions play a significant role in what could be defined as “a good life”. Findings from existing studies on children’s quality of life have shown that peer relations are associated with both positive and negative outcomes. Positive aspects of peer relations, and especially friendship, are considered to promote one’s quality of life, while negative aspects decrease children’s quality of life. The overall aim of this master thesis was to examine the associations between peer relations and children’s quality of life. More specifically, it focused on associations between popularity and friendships and self-reported quality of life in 11-12-year-olds. The current study was based on data collected for a larger ongoing research project – “The Health Oriented Pedagogical Project” (HOPP). Principal investigator of the project is Per Morten Fredriksen (Kristiania University College, Department of Health Science, Oslo; Norway). At the baseline in 2015 there were 2297 children from 6 to 12 years old who participated in the project. The HOPP is a longitudinal intervention study with multi-informant and multi-method design. Results show that both popularity and reciprocal friendship had a positive association with children’s quality of life. Number of nominations (both for popularity and reciprocal friendship) played a significant role for mentioned above associations. Findings from the current study contribute in contemporary research focused on children’s quality of life and may imply that schools can contribute beneficially in implementing interventions aimed to promote children’s quality of life.