The study's main aim is to examine public sector efficiency regarding the influence of HRIS on HR functions and employee satisfaction in public sector undertakings (PSUs) of India. In addition, the study focuses on the impact of HRIS on administrative efficiency and HR processes in PSUs of Odisha, which are located in India. It also analyses the effect of HRIS on employee satisfaction and engagement. Lastly, it identifies challenges and best practices in implementing HRIS in the public sector. The research employs a quantitative approach using structured surveys distributed to 500 executives from various PSUs in Odisha. Stratified sampling ensures representation across different PSUs. The survey instrument is carefully designed and validated to measure HRIS influence on HR functions and employee satisfaction. Data analysis involves statistical techniques like regression analysis to examine relationships. The study revealed that HRIS significantly improved HR functions in PSUs of Odisha, India, by streamlining administrative tasks, enhancing data accuracy, and facilitating better decision-making. Employees reported increased satisfaction due to easier access to personal information, quicker resolution of HR issues, and more transparent communication. However, challenges such as technical glitches and initial resistance to change were noted. Overall, the integration of HRIS positively impacted efficiency and satisfaction, underscoring the need for continuous training and support. To implement HRIS effectively in these PSUs, it is crucial to conduct comprehensive employee training, establish a dedicated technical support team, and ensure continuous system updates. Addressing initial resistance through change management strategies and promoting the benefits of HRIS can further enhance acceptance and utilization.