Introduction: Researches show that workplace quality play important role in developing job involvement. The purpose of this study was to determine the predicted power of job involvement by perceived supervisor support and perceived coworker support.

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Material and Method: This research was a cross-sectional study. The participants consisted of 189 employees from Isfahan Steel Company in 2012 and they were selected according to the stratified random sampling method and responded questionnaires about demographic characteristics, perceived supervisor support, perceived coworker support and job involvement. Data was analyzed using Pearson correlation coefficient and regression analysis.

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Result: The results showed that there were significant relationships between perceived supervisor support and perceived coworker support with job involvement (p<0.05). Also, results indicated that the variables of perceived supervisor support and perceived coworker support significantly predicted almost 13% and 11% of job involvement variance (p<0.05).

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Conclusion: The research results maintain the importance of psycho-social variables in predicting job involvement in workers.