Objective: The objectives of this study are: 1. evaluate the effect of job-related diversity on collective organizational commitment in public sector organizations in Nigeria; 2. evaluate the effect of cultural diversity on collective organizational commitment in public sector organizations in Nigeria. The aim of the study is to examine diversity in the workplace to achieve collective organizational commitment in public sector organizations in Nigeria. Theoretical Framework: In this topic, the main concepts and theories that underpin the research are presented. The theory that is related to this work having reviewed some theories is the Social Identity Theory. Social identity theory is a social psychological theory that is utilized in organizations to obtain high employee performance. Social identity theory gives more understanding of diversity in terms of understanding the role of group divisions in organization. Method: The study relied on a self-developed structured questionnaire as the instrument for data collection. Using SPSS version 20 software, descriptive statistics and multiple regression analysis were used to assess the data and statistically analysed the data that had been collected. Results and Discussion: The findings revealed that job-related diversity has a significant effect on collective organizational commitment in public sector organizations in Nigeria (β=0.077, p<0.05), and that cultural diversity has no significant effect on collective organizational commitment in public sector organizations in Nigeria (β =0.030, p>0.05). Originality/Value: Previous studies had focused on different types of diversity and their attributes, but have not adequately addressed the factors that can strengthen the relationships. This study to filled this gap by examining the impact of workplace diversity on organizational commitment in the Nigerian Public Sector Organizations. The research also highlighted the need for a combination of cultural and experiential factors to understand the challenges faced by employees in a diverse workplace..
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