The nature of jobs, across the globe, is becoming more complex and demanding since last few decades. Historically the word stress is derived from the Latin word “strictus” which means taut “stiffly strung”. In last 40 years it’s become alarming and felt change in the nature at workplace. The study aims to investigate the Occupational stress and its consequences on In-role and Extra-role performance behavior of employees in the security organizations. The study also examined the moderating role of Surface Acting and Deep Acting on performance behavior. The Data was collected from 144 first rank police officers (Assistant sub-inspector) working in Islamabad police. Data was analyzed by using SPSS software and results proved that the present research providing us knowledge about Occupational stress and Performance behavior. However, hypothesis testing results proved that Occupational stress has significant negative impact on employee Extra-role performance behavior and has no significant impact on In-role performance behavior and emotional labour (surface and deep acting has no significant moderating the relationship between Occupational stress and performance. Supervisor:- Ms. Mariam Mohsin