The goal of the research was to fi nd relationship between perceived social support and psychological well-being among young people, and to verify if the growth mindset is a mediator of this relationship. The research was also aimed to examine whether there are differences between young people being reared in an orphanage and those who are not, in terms of measured variables. The study included 198 participants, aged 15 to 22 (M = 18.35; SD = 1.12), 46% females. The Interpersonal Support Evaluation List, the Psychological Well-Being Scale and the Implicit Theories Scale were used. The perceived social support positively correlates with psychological well-being. The growth mindset is not a mediator in this relationship, although it positively correlates with both variables. Young people being reared in an orphanage display a stronger growth mindset than young people not being reared in an orphanage.