An unprecedented economic, social, technological and market change over the last thirty years has led to stressful workplace environment. Occupational stress is a key factor in psychological distress which adversely affects job satisfaction and performance. This study aims to examine the relationship between dimensions of occupational stress and mental health in a large industrial plant in the northwest of Iran. A questionnaire consisted of personal information and items related to respondents’ occupational role and general health was distributed among 400 production staff of an assembly plant using backward multiple regression analysis. The findings revealed that while the most significant predictor of somatic symptoms, and anxiety and insomnia were role overload, the most significant predictor of social dysfunction and severe depression was role boundary. The findings and implications for organization and health practitioners are discussed.

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