Purpose:The aim of this study was to investigate the relationship between mobile phone addiction and occupational balance in university students. Material and Methods: A sample of 128 students attending a public university in Turkey participated in the study. Smartphone addiction was evaluated using the Smartphone Addiction Scale (SPAS-SF) and occupational balance with the Turkish Occupational Balance Questionnaire (OBQ11-T). The students' demographic characteristics were recorded. Results: A negative correlation was observed between SPAS-SF and OBQ11-T total score and scores for item 4 (Balance between work, home, family, leisure, rest, and sleep), item 6 (Balance between physical, social, mental, and restful occupations), and item 10 (Balance between energy-giving/energy-taking activities). Economic status was associated with significant differences in for item 3 (Time for doing things wanted) and item 11 (Satisfaction with time spent in rest, recovery, and sleep) (p<.05). Item 9 (Balance between obligatory/voluntary occupations) differed significantly between students living in student housing and those living at home (p<.05). Occupational balance scores did not differ by gender (p>.05). Discussion: The current study demonstrates that problematic smartphone usage is associated with occupational balance among university students. Occupational therapists may consider smartphone addiction as a confounding factor of occupational balance.