In recent years, there has been a noticeable increase in organizational trends to hire irregular workers. This inclination, in a time of great flux and uncertainty, exacerbates human resource issues faced by firms. We argue that corporate social responsibility (CSR) can be an important antecedent to improve the workplace attitudes of irregular workers and as a result reduce the negative impact on organizations of the increased use of an irregular workforce. Hence, we explore the relationship between perceived CSR (composite and disaggregated) and unfairness perception and social relations of subcontracted workers with regular workers. We further attempt to explain these relationships through the mediating effects of psychological contract violation and organizational identity, respectively. Our analysis supports a negative effect of composite and external CSR on unfairness perception and positive effect on social relations. Additionally, our results support partial mediating roles of psychological contract violation and organizational identity. Theoretical and practical implications of the results are also discussed.