This study aims to analyze the effect of Transformational Leadership Style, Organizational Commitment and Work Environment on Organizational Citizenship Behavior (OCB) with Job Satisfaction as an Intervening Variable (Case Study Employees of PT. Tubagus Wira Manunggal. The population in this study were employees of PT. Tubagus Wira Manunggal as many as 110 employees. The sample used in this study is a total sample or saturated sampling. The method of analysis used in this study is the Partial analysis method. Least Square (PLS). The results showed that (1) Transformational Leadership Style has a positive and significant effect on Job Satisfaction, (2) Organizational Commitment has a positive and significant effect on Job Satisfaction, (3) Work Environment has a positive and significant effect on Job Satisfaction. r Job Satisfaction, (4) Transformational Leadership Style has a significant effect on Organizational Citizenship Behavior with Job Satisfaction as an intervening variable, (5) Organizational Commitment has a significant effect on Organizational Citizenship Behavior with Job Satisfaction as an intervening variable, (6) Work Environment has a significant effect on Organizational Citizenship Behavior with Job Satisfaction as an intervening variable, and (7) Job Satisfaction has a significant effect on Organizational Citizenship Behavior.