Perfectionism is a transdiagnostic process of beginning or maintenance that is significantly related to psychological well-being. Aim of this paper is to identify the relationship between perfectionism and psychological well-being in children and adolescents. A systematic search of the studies was carried out in accordance with the criteria of the PRISMA guide (Urrútia & Bonfill, 2010). The databases used for the search were: Scopus, Scielo-Scientific Electronic, PubMet, ProQuest, Dialnet and APA PsycNET. Articles that assess perfectionism and psychological well-being in children and adolescents were selected for this analysis (n =13). The methodology employed in the selected research was correlational and mostly cross-sectional. The studies were measured by psychometric instruments that are reliable and valid. Perfectionism has an adaptive (healthy) and a maladaptive (unhealthy) compon...