The purpose of this study is to examine the mediating effect of social connectedness on the relationship between university students' parents acceptance-rejection and loneliness. The research was carried out with the descriptive research method. The universe of the research consists of 6818 students who attend Atatürk Faculty of Education in the 2019-2020 academic year. The sample of the study was determined using the stratified sampling method. The sample of the study consists of 387 university students, 271 of whom are women (70%) and 116 of them are men (30%). The scales used are Adult Parental Acceptance-Rejection Scale - Short Form, Ucla Loneliness Scale and Social Connectedness Scale. In line with the main purpose of the study, the model proposed to explain loneliness theoretically was tested and tested by the Structural Equation Model analysis. Relationship between variables in data analysis were determined by Pearson Correlation Analysis. The findings show that the model has acceptable significance and the model is statistically confirmed. According to the verified model; it is seen that the perception of parents' acceptance/rejection in childhood has an effect on loneliness. When the mediator effect of social connectedness is examined, in the model; it appears that the mediating role of social connectedness is confirmed.