The aim of this correlational study was to predict cyberloafing through basic psychological needs with conscientiousness and goal-orientation as mediators. The statistical population consisted of all undergraduate students of faculty of Humanities at Mazandaran University during the academic year of 2016. A total of 321 students were selected using stratified proportional sampling and the final. In order to collect data Cyberloafing scale (Doorn , 2008), the Conscientiousness of the Big Five Personality Questionnaire (Goldberg, 1992), Mastery Goal orientation of Goal Orientation scale (Midgley et al, 1998) and the Psychological Needs Questionnaire based on William Glasser Theory (Burns et al, 2006) were used. Data obtained was analyzed by AMOSS-22 software for structural equation analysis. According to the results, the need for survival and the need for belonging could indirectly predict cyberloafing with conscientiousness and mastery goal orientation as mediators. Moreover, the need for Fun, mastery goal orientation and conscientiousness could directly and significantly predict cyberloafing.