The purpose of the study was to examine whether personality traits had a mediator role on the relationship between university students' digital addiction behaviour and academic self-efficacy. The study sample consisted of 1348 students (876 females and 472 males) who were chosen through random sampling from university students who from different universities in Turkey. For data collection, Digital Addiction Scale, Academic Self-Efficacy Scale, Adjective Based Personality Test, and personal information form have been used. The results of the study indicate that personality traits fully mediate the relationship between digital addiction and academic self-efficacy.