In this study we aimed to investigate the role of hope, secure attachment with the parents, and satisfaction levels of the basic psychological needs (autonomy, competence and relatedness) of university students in predicting their happiness levels. A total of 558 university students were recruited and 70% of them were female and 30% of them were male. Ages of the participants ranged from 18 to 29. The data were collected in classroom settings using personal information form, the Oxford Happiness Scale, the Attachment with the Parents Scale, the Basic Psychological Needs Scale, and the Dispositional Hope Scale. Results indicated that that the satisfaction levels of the competence needs were the most powerful predictor of happiness among university students. The satisfaction levels of autonomy, relatedness needs, and a secure attachment to the father, along with hope contributed little to the explanation of happiness; whereas, a secure attachment to the mother was not a predictor of happiness of the university students. The findings were discussed within the framework of the developmental characteristics of university students and the characteristics of collectivist societies.