This study is conducted on the “The role of job security on the employee performance and satisfaction at OGDCL Pakistan”. The main objective of this research is to understand the impact of job security on employees through job performance, and job satisfaction. The data collected from 150 employees of OGDCL Pakistan in Islamabad. The primary data is collected for this research and the method used for this study was quantitative for data analysis. SPSS has been used to inspect the data. The findings of this study show that job security has a positive effect on employee’s job satisfaction and a negative effect on job performance although because of job satisfaction somehow job performance increases in mediating role of job satisfaction between job security and Job performance. This research work will be helpful to the high authorities of OGDCL in decision making and a better understanding of employee’s behavior at OGDCL Pakistan. Supervisor:- Dr. Hassan Rasool