This paper analyzes the essential function of Human Resource Management (HRM) in promoting diversity, equality, and inclusion (DEI) in the workplace. Human Resource Management has historically concentrated on personnel administration, recruitment, payroll, and adherence to labor regulations. As the workforce grows increasingly diverse and worldwide, Human Resource Management must adapt to tackle the intricate issues of managing diversity. The document examines essential aspects of diversity, including color, gender, age, sexual orientation, disability, and cultural background, highlighting the significance of fostering inclusive work environments. Organizations can promote creativity, improve decision-making, raise employee engagement, and retain top talent by using DEI-focused HR initiatives, including inclusive recruitment, bias training, performance management, and leadership development. The document emphasizes the strategic imperative of Diversity, Equity, and Inclusion (DEI) in contemporary human resource practices, examining effective case studies from organizations such as Microsoft, Google, and Salesforce. The results highlight that a dedication to DEI enhances workplace culture while simultaneously improving organizational performance and competitiveness.