Objective: The objective of this study was to examine the role of organizational behavior (OB) and leadership styles towards Employees Performance (EP) in petrochemical companies in Saudi Arabia. Method: This study is quantitative and applied an online approach using Google. Forms to gather the information from the respondents. The study utilized 165 valid responses to conclude the investigation. Using multiple regression analysis, the study highlights the influence of Organizational Behavior (OB), Democratic Leadership Style (DLS), and Bureaucratic Leadership Styles (BLS) on Employees Performance (EP). Results: The findings showed that OB has positively affected the EP. Three out of five hypotheses (two independent variables and one mediator variable) were statistically significant: OB (T=-3.678, p<0.001, β= -0.240), DLS (T= 5.604, p<0.001, β=0.383), and BLS (T= 2.979, p=0.003, β= 0.195) in EP. ALS, on the other hand, was not statistically significant in EP (T =0.922, p=0.358, and β=0.063). Also, LLS was not statistically significant in EP (T=1.427, p=0.155, and β= 0.099). Conclusions: The findings suggest specific ways to enhance the leadership and EP of supervisors. It indicated that increased EP would result from a DLS and BLS. Leaders or supervisors should be aware of what is crucial for their teams and businesses and inspire their team members to view possibilities and problems in new ways. Supervisors should also have their own goals and strategies for helping subordinates grow as team players and collaborative workers. Supervisors should be innovative and inspire associates to look for more options and possibilities rather than settling for performance that meets standards. Supervisors should be aware of the values of their employees and develop business strategies, plans, procedures, and practices for their department or unit that will likely enhance employees' well-being. Respect for people is essential to developing a good working relationship between managers and staff.