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The purpose of this study was to investigate the mediating role of basic psychological needs in the relationship between family function and happiness. The research population consisted of all students living in the residence of Alzahra University in Tehran during 2019-2020. 300 of them were selected by convenience sampling method. The research method was descriptive-correlative type. In the present study, descriptive and inferential statistical methods were used to analyze the data, skewness and elongation were used to determine the normality of the data, and path analysis was used to evaluate the proposed model. The questionnaires used in this study were the short version of the Oxford Happiness Questionnaire (OHQ_SF), the Family Assessment Device (FAD), and the Psychological Basic Needs Questionnaire (BPNS) (.SPSS 24 and AMOS 24 software were used. The results showed that all subscales of family functioning were significantly correlated with happiness. The proposed modified empirical model showed good fit indices. According to this model, family functioning (problem solving, family roles, affective responsiveness, affective involvement, behavioral control, general functioning) showed direct and indirect effects on happiness. In addition, basic psychological needs (autonomy, competence, relatedness) had a partial mediating role in the relationship between family functioning and happiness.