Abstract: Individual differences in terms of personality traits have been investigated in relation to employee work behavior. However, very few scholars have included religiosity as an individual difference variable in such investigations. We developed and tested a model to explain how religiosity and emotional stability personality trait) can affect organizational citizenship and deviant behaviors of employees. Analysis of data from 261 public organization employees showed that high religiosity and emotional stability employees were more likely to engage in organizational citizenship behavior and this engagement in turn resulted in lower levels of workplace deviant behavior. Religiosity, emotional stability and organizational citizenship behavior explained 60% of the variance in workplace deviant behavior. The findings underscore the important role of dispositional characteristics in understanding workplace deviant behavior. This is one of the few studies that has examined religiosity as one of the dispositional characteristics, that would impact on employee citizenship and deviant behavior at work. Implications of the results are discussed.