Background and Objective: Mobile phone addiction has become one of the major mental health challenges among adolescents and may have adverse effects on their academic performance, social relationships, and psychological well-being. Therefore, the present study aimed to explain mobile phone addiction among adolescent female students based on emotional regulation styles and the dimensions of perfectionism.

Methods: This descriptive-correlational study was conducted among female high school students in District 6 of Tehran. A total of 200 students were selected using a multistage cluster random sampling method. Participants completed the Perfectionism Scale (1995), the Emotional Regulation Styles Scale (2010), and the Mobile Phone Addiction Scale (2014). The collected data were analyzed using SPSS version 22.

Results: The results showed that emotional regulation styles (β= −0.53, P< 0.01) and positive perfectionism (β= −0.46, P< 0.01) were significantly and negatively associated with mobile phone addiction. Furthermore, negative perfectionism was positively and significantly associated with mobile phone addiction among students (β= 0.36, P< 0.01).

Conclusion: Based on the findings of the present study, it can be concluded that adolescents' ability to effectively regulate their emotional responses and maintain adaptive, positive perfectionistic beliefs may serve as protective factors against mobile phone addiction. Strengthening emotional regulation skills and promoting healthy perfectionistic attitudes may therefore help reduce the tendency toward addictive mobile phone use, particularly among adolescent girls.